mailcowdockerized-unbound-mailcow-1 is unhealthy

[B-elorchi]

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Description

I have recently set up Mailcow on my server using Docker. All containers appear to be running, but I am experiencing issues with service access. Below is the output of docker ps -a for reference:

Logs:

root@mail:/opt/mailcow-dockerized# docker ps -a
CONTAINER ID   IMAGE                            COMMAND                  CREATED         STATUS                     PORTS                                                                                                                                                                                                                                         NAMES
3c0fd26892ea   ghcr.io/mailcow/watchdog:2.08    "/watchdog.sh"           5 minutes ago   Created                                                                                                                                                                                                                                                                  mailcowdockerized-watchdog-mailcow-1
9763c5d83209   ghcr.io/mailcow/acme:1.93        "/sbin/tini -g -- /s…"   5 minutes ago   Created                                                                                                                                                                                                                                                                  mailcowdockerized-acme-mailcow-1
64d267e58c86   ghcr.io/mailcow/nginx:1.03       "/docker-entrypoint.…"   5 minutes ago   Created                                                                                                                                                                                                                                                                  mailcowdockerized-nginx-mailcow-1
aea80119ae4c   ghcr.io/mailcow/rspamd:2.2       "/docker-entrypoint.…"   5 minutes ago   Created                                                                                                                                                                                                                                                                  mailcowdockerized-rspamd-mailcow-1
7aa6b31c5cdc   mcuadros/ofelia:latest           "/usr/bin/ofelia dae…"   5 minutes ago   Up 5 minutes                                                                                                                                                                                                                                                             mailcowdockerized-ofelia-mailcow-1
07ae4be09644   ghcr.io/mailcow/phpfpm:1.93      "/docker-entrypoint.…"   5 minutes ago   Up 5 minutes               9000/tcp                                                                                                                                                                                                                                      mailcowdockerized-php-fpm-mailcow-1
ade773fca46c   ghcr.io/mailcow/dovecot:2.34     "/docker-entrypoint.…"   5 minutes ago   Up 5 minutes               0.0.0.0:110->110/tcp, [::]:110->110/tcp, 0.0.0.0:143->143/tcp, [::]:143->143/tcp, 0.0.0.0:993->993/tcp, [::]:993->993/tcp, 0.0.0.0:995->995/tcp, [::]:995->995/tcp, 0.0.0.0:4190->4190/tcp, [::]:4190->4190/tcp, 127.0.0.1:19991->12345/tcp   mailcowdockerized-dovecot-mailcow-1
2cf5d1a8a2fe   ghcr.io/mailcow/postfix:1.80     "/docker-entrypoint.…"   5 minutes ago   Created                                                                                                                                                                                                                                                                  mailcowdockerized-postfix-mailcow-1
6eb0dff1c803   mariadb:10.11                    "docker-entrypoint.s…"   5 minutes ago   Up 5 minutes               127.0.0.1:13306->3306/tcp                                                                                                                                                                                                                     mailcowdockerized-mysql-mailcow-1
ff5b74542696   redis:7.4.2-alpine               "/bin/sh /redis-conf…"   5 minutes ago   Up 5 minutes               127.0.0.1:7654->6379/tcp                                                                                                                                                                                                                      mailcowdockerized-redis-mailcow-1
5799ee4d03c6   ghcr.io/mailcow/clamd:1.70       "/sbin/tini -g -- /c…"   5 minutes ago   Created                                                                                                                                                                                                                                                                  mailcowdockerized-clamd-mailcow-1
3569b20a2311   ghcr.io/mailcow/dockerapi:2.11   "/bin/sh /app/docker…"   5 minutes ago   Up 5 minutes                                                                                                                                                                                                                                                             mailcowdockerized-dockerapi-mailcow-1
f96b25b1412d   ghcr.io/mailcow/sogo:1.133       "/docker-entrypoint.…"   5 minutes ago   Up 5 minutes                                                                                                                                                                                                                                                             mailcowdockerized-sogo-mailcow-1
180f184990d5   ghcr.io/mailcow/unbound:1.24     "/docker-entrypoint.…"   5 minutes ago   Up 5 minutes (unhealthy)   53/tcp, 53/udp                                                                                                                                                                                                                                mailcowdockerized-unbound-mailcow-1
ef6f16a5a064   memcached:alpine                 "docker-entrypoint.s…"   5 minutes ago   Up 5 minutes               11211/tcp                                                                                                                                                                                                                                     mailcowdockerized-memcached-mailcow-1
4c10b657dc6b   ghcr.io/mailcow/olefy:1.15       "python3 -u /app/ole…"   5 minutes ago   Up 5 minutes                                                                                                                                                                                                                                                             mailcowdockerized-olefy-mailcow-1
60f29ca16d76   ghcr.io/mailcow/netfilter:1.61   "/bin/sh -c /app/doc…"   5 minutes ago   Up 5 minutes                                                                                                                                                                                                                                                             mailcowdockerized-netfilter-mailcow-1
root@mail:/opt/mailcow-dockerized#


and this part of update
docker.io/mcuadros/ofelia:latest
Stopping mailcow...
[+] Running 12/12
 ✔ Container mailcowdockerized-ofelia-mailcow-1     Removed                                                                                                                                                  10.2s
 ✔ Container mailcowdockerized-memcached-mailcow-1  Removed                                                                                                                                                   0.7s
 ✔ Container mailcowdockerized-php-fpm-mailcow-1    Removed                                                                                                                                                  10.1s
 ✔ Container mailcowdockerized-dockerapi-mailcow-1  Removed                                                                                                                                                   0.3s
 ✔ Container mailcowdockerized-olefy-mailcow-1      Removed                                                                                                                                                  10.1s
 ✔ Container mailcowdockerized-sogo-mailcow-1       Removed                                                                                                                                                   1.0s
 ✔ Container mailcowdockerized-dovecot-mailcow-1    Removed                                                                                                                                                  10.5s
 ✔ Container mailcowdockerized-mysql-mailcow-1      Removed                                                                                                                                                   0.3s
 ✔ Container mailcowdockerized-redis-mailcow-1      Removed                                                                                                                                                   0.2s
 ✔ Container mailcowdockerized-unbound-mailcow-1    Removed                                                                                                                                                  10.1s
 ✔ Container mailcowdockerized-netfilter-mailcow-1  Removed                                                                                                                                                  30.0s
 ✔ Network mailcowdockerized_mailcow-network        Removed                                                                                                                                                   0.2s
Checking for remaining containers...
Committing current status...
Fetching updated code from remote...
Merging local with remote code (recursive, strategy: "theirs", options: "patience"...
Already up to date.
Fetching new images, if any...
[+] Pulling 17/17
 ✔ memcached-mailcow Pulled                                                                                                                                                                                   0.8s
 ✔ olefy-mailcow Pulled                                                                                                                                                                                       0.5s
 ✔ redis-mailcow Pulled                                                                                                                                                                                       0.8s
 ✔ nginx-mailcow Pulled                                                                                                                                                                                       0.5s
 ✔ netfilter-mailcow Pulled                                                                                                                                                                                   0.5s
 ✔ postfix-mailcow Pulled                                                                                                                                                                                     0.5s
 ✔ acme-mailcow Pulled                                                                                                                                                                                        0.5s
 ✔ dovecot-mailcow Pulled                                                                                                                                                                                     0.5s
 ✔ watchdog-mailcow Pulled                                                                                                                                                                                    0.5s
 ✔ rspamd-mailcow Pulled                                                                                                                                                                                      0.5s
 ✔ sogo-mailcow Pulled                                                                                                                                                                                        0.5s
 ✔ clamd-mailcow Pulled                                                                                                                                                                                       0.5s
 ✔ php-fpm-mailcow Pulled                                                                                                                                                                                     0.5s
 ✔ ofelia-mailcow Pulled                                                                                                                                                                                      0.8s
 ✔ mysql-mailcow Pulled                                                                                                                                                                                       0.8s
 ✔ unbound-mailcow Pulled                                                                                                                                                                                     0.5s
 ✔ dockerapi-mailcow Pulled                                                                                                                                                                                   0.5s
cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
Checking IPv6 settings...
Starting mailcow...
WARN[0000] mount of type `volume` should not define `bind` option
WARN[0000] mount of type `volume` should not define `bind` option
[+] Running 7/10
 ✔ Network mailcowdockerized_mailcow-network        Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-dockerapi-mailcow-1  Created                                                                                                                                                   0.1s
 ✔ Container mailcowdockerized-netfilter-mailcow-1  Created                                                                                                                                                   0.1s
 ✔ Container mailcowdockerized-olefy-mailcow-1      Created                                                                                                                                                   0.1s
[+] Running 18/18cowdockerized-memcached-mailcow-1  Created                                                                                                                                                   0.1s
 ✔ Network mailcowdockerized_mailcow-network        Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-dockerapi-mailcow-1  Started                                                                                                                                                   0.3s
 ✔ Container mailcowdockerized-netfilter-mailcow-1  Started                                                                                                                                                   0.2s
 ✔ Container mailcowdockerized-olefy-mailcow-1      Started                                                                                                                                                   0.3s
 ✔ Container mailcowdockerized-memcached-mailcow-1  Started                                                                                                                                                   0.3s
 ✘ Container mailcowdockerized-unbound-mailcow-1    Error                                                                                                                                                    90.5s
 ✔ Container mailcowdockerized-sogo-mailcow-1       Started                                                                                                                                                   0.3s
 ✔ Container mailcowdockerized-clamd-mailcow-1      Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-redis-mailcow-1      Started                                                                                                                                                   0.4s
 ✔ Container mailcowdockerized-mysql-mailcow-1      Started                                                                                                                                                   0.4s
 ✔ Container mailcowdockerized-dovecot-mailcow-1    Started                                                                                                                                                   0.6s
 ✔ Container mailcowdockerized-postfix-mailcow-1    Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-php-fpm-mailcow-1    Started                                                                                                                                                   0.5s
 ✔ Container mailcowdockerized-ofelia-mailcow-1     Started                                                                                                                                                   0.7s
 ✔ Container mailcowdockerized-rspamd-mailcow-1     Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-nginx-mailcow-1      Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-acme-mailcow-1       Created                                                                                                                                                   0.0s
 ✔ Container mailcowdockerized-watchdog-mailcow-1   Created                                                                                                                                                   0.0s
dependency failed to start: container mailcowdockerized-unbound-mailcow-1 is unhealthy
Collecting garbage...
root@mail:/opt/mailcow-dockerized# docker logs mailcowdockerized-unbound-mailcow-1
Setting console permissions...
Receiving anchor key...
Receiving root hints...
root@mail:/opt/mailcow-dockerized#

Steps to reproduce:

1/ Run update.sh

Which branch are you using?

master

Which architecture are you using?

x86

Operating System:

Ubuntu 24

Server/VM specifications:

8GB , 4 CPU

Is Apparmor, SELinux or similar active?

yes

Virtualization technology:

Proxmox

Docker version:

28.1.1

docker-compose version or docker compose version:

Docker Compose version v2.35.1

mailcow version:

2025-07

Reverse proxy:

Nginx

Logs of git diff:

root@mail:/opt/mailcow-dockerized# git diff origin/master
diff --git a/data/assets/ssl-example/cert.pem b/data/assets/ssl-example/cert.pem
index 96d16bec..a102ff5a 100644
--- a/data/assets/ssl-example/cert.pem
+++ b/data/assets/ssl-example/cert.pem
@@ -1,19 +1,33 @@
 -----BEGIN CERTIFICATE-----
-MIIDBDCCAe6gAwIBAgIQeJMoL/3dxhxhT9EwuRTL/DALBgkqhkiG9w0BAQswEjEQ
-MA4GA1UEChMHbWFpbGNvdzAeFw0xNjEyMTMxMDExMDBaFw0xOTExMjgxMDExMDBa
-MC0xEDAOBgNVBAoTB21haWxjb3cxGTAXBgNVBAMTEG1haWwuZXhhbXBsZS5vcmcw
-ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDRg0xT3At9DSb3H5OMp3K1
-MpXAgYyotSK6TS61fC0QEHy2fMXiws7Agcye6Ln7CG63Fe1eN2jkdlefy9xJivS8
-y5w0M8i168v5znzC8fnylL2iOiSYfK/B/oEqfU7YH4RcegO53oDDIUZmi4Frgnu7
-39VVOU1ZyHEVqGJ2H2aAIkoZRjGzumD9Ym4LWGidtKJzBgFt/qmhUeWXipM8w281
-XkQnJU79+x2ywnJSvEZ3r/ZVJC7kbjiVw+/k15k9Cxk6Ik8wmJ0X/+xWxoZomHQI
-1LM0VKAS/iaU95dn2bplvL6jTiiyWAbrMjSKs4XbPt/fIbOicNkj6+CFy0MVfyyH
-AgMBAAGjPzA9MA4GA1UdDwEB/wQEAwIAqDAdBgNVHSUEFjAUBggrBgEFBQcDAgYI
-KwYBBQUHAwEwDAYDVR0TAQH/BAIwADALBgkqhkiG9w0BAQsDggEBAI/jBJa1P8nB
-eHUN5muQmjBVDVOYyWAAEapOe2HYsBcpjaB2H8Iw3DQzJtz6peYeYSCmHRVqFLCm
-VPrq36l9mPUotyPDPlQQAxCj9R2+WbGaJO+N/E1F8FQ94dr3jqwUyfjVPoqEjmIH
-NFkvbA0RJOeBm9oYGdhM0wjOBV9c9MTHFG82nQ/zQeTuPb7GXuKIOXYCxoLNOZMw
-UJ02Cqjv5ImrgOhcstAKX3Ip0urSvZUGvtPla4CGh+M6yDFJ08GzX6OiMIH207RW
-jAbUXXERSUv/7hysdDjGo5HZjCeMzVu9KAxoZXqnmvkk8g2swKWtWBRcoeU1VGx0
-Bx4Q4KMjuYQ=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+RdLfDUrOI/3giegga4/lW36vUGRYumkFekWBa9x4yiEKRY5eFNlsVBK7rn2rPO8J
+HouxdqgAqi0IeIhytjR5TryqfNrU3Ww+d9eYrYAZtdZWqRviSYn7GA4atdxlk5Mn
+SZIrasHJyZhDSplhUKJAiBTuKbtPKA8ojutHm7XbZ9q5BGlKw621rcabAkunL94o
+FUxTuSBRq1uzNaO4AWph+uW9dAyPmwhwrxqWeY9jZWYR9zFWSalWUHXLg3jBjce0
+tLhiVrUeyw4zA26mgCD+pOe46Z3mSwdw5qWHI68MXBRO+rlWTk99xNBr85R7qXpD
+KuCBCEwBoA4d64m+XWCxl1lzFMqKNrzjT5q3AnFz3rswZ40rSntwBUOVciPI+oHt
+KuzPBRZCFzSpJGZvPwUPzTgzzVhboihhQwqN4dm5eF6GDoEzTpQ1Ya6WxnvRJL9X
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+WJkNU76ueA6f17ztGlvoT/4/EYyDiZHgpPQT9uECAwEAAaNTMFEwHQYDVR0OBBYE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:

Logs of iptables -L -vn:

root@mail:/opt/mailcow-dockerized# iptables -L -vn
Chain INPUT (policy ACCEPT 18433 packets, 2635K bytes)
 pkts bytes target     prot opt in     out     source               destination
18433 2635K MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */
18433 2635K MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */
18433 2635K MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
 9428 1138K MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */
 5428  907K DOCKER-USER  0    --  *      *       0.0.0.0/0            0.0.0.0/0
 5428  907K DOCKER-FORWARD  0    --  *      *       0.0.0.0/0            0.0.0.0/0
    0     0 MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */
    0     0 MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */
    0     0 MAILCOW    0    --  *      *       0.0.0.0/0            0.0.0.0/0            /* mailcow */

Chain OUTPUT (policy ACCEPT 20408 packets, 21M bytes)
 pkts bytes target     prot opt in     out     source               destination
  400 25998 ACCEPT     17   --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:53
    0     0 ACCEPT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:53

Chain DOCKER (2 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.250         tcp dpt:12345
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.250         tcp dpt:4190
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.250         tcp dpt:995
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.250         tcp dpt:993
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.250         tcp dpt:143
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.250         tcp dpt:110
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.5           tcp dpt:3306
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  0.0.0.0/0            172.22.1.249         tcp dpt:6379
    0     0 DROP       0    --  !docker0 docker0  0.0.0.0/0            0.0.0.0/0
    0     0 DROP       0    --  !br-mailcow br-mailcow  0.0.0.0/0            0.0.0.0/0

Chain DOCKER-BRIDGE (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER     0    --  *      docker0  0.0.0.0/0            0.0.0.0/0
    0     0 DOCKER     0    --  *      br-mailcow  0.0.0.0/0            0.0.0.0/0

Chain DOCKER-CT (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 ACCEPT     0    --  *      docker0  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
  369  154K ACCEPT     0    --  *      br-mailcow  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED

Chain DOCKER-FORWARD (1 references)
 pkts bytes target     prot opt in     out     source               destination
 5428  907K DOCKER-CT  0    --  *      *       0.0.0.0/0            0.0.0.0/0
 3752  238K DOCKER-ISOLATION-STAGE-1  0    --  *      *       0.0.0.0/0            0.0.0.0/0
 3752  238K DOCKER-BRIDGE  0    --  *      *       0.0.0.0/0            0.0.0.0/0
    0     0 ACCEPT     0    --  docker0 *       0.0.0.0/0            0.0.0.0/0
  806 51190 ACCEPT     0    --  br-mailcow *       0.0.0.0/0            0.0.0.0/0

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER-ISOLATION-STAGE-2  0    --  docker0 !docker0  0.0.0.0/0            0.0.0.0/0
  806 51190 DOCKER-ISOLATION-STAGE-2  0    --  br-mailcow !br-mailcow  0.0.0.0/0            0.0.0.0/0

Chain DOCKER-ISOLATION-STAGE-2 (2 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DROP       0    --  *      br-mailcow  0.0.0.0/0            0.0.0.0/0
    0     0 DROP       0    --  *      docker0  0.0.0.0/0            0.0.0.0/0

Chain DOCKER-USER (1 references)
 pkts bytes target     prot opt in     out     source               destination
 5428  907K RETURN     0    --  *      *       0.0.0.0/0            0.0.0.0/0

Chain MAILCOW (7 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DROP       6    --  !br-mailcow br-mailcow  0.0.0.0/0            0.0.0.0/0            /* mailcow isolation */
    0     0 ACCEPT     6    --  *      br-mailcow  0.0.0.0/0            0.0.0.0/0            multiport dports 53,443
 4004  234K DROP       6    --  !br-mailcow br-mailcow  0.0.0.0/0            0.0.0.0/0            /* mailcow isolation */
    0     0 ACCEPT     6    --  ens18  *       192.168.100.1        0.0.0.0/0            multiport dports 25,80,465,587
    0     0 DROP       6    --  !br-mailcow br-mailcow  0.0.0.0/0            0.0.0.0/0            /* mailcow isolation */
    0     0 DROP       6    --  !br-mailcow br-mailcow  0.0.0.0/0            0.0.0.0/0            /* mailcow isolation */
root@mail:/opt/mailcow-dockerized#

Logs of ip6tables -L -vn:

root@mail:/opt/mailcow-dockerized#  ip6tables -L -vn
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 MAILCOW    0    --  *      *       ::/0                 ::/0                 /* mailcow */
    0     0 DOCKER-USER  0    --  *      *       ::/0                 ::/0
    0     0 DOCKER-FORWARD  0    --  *      *       ::/0                 ::/0

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain DOCKER (2 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  ::/0                 fd4d:6169:6c63:6f77::a  tcp dpt:4190
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  ::/0                 fd4d:6169:6c63:6f77::a  tcp dpt:995
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  ::/0                 fd4d:6169:6c63:6f77::a  tcp dpt:993
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  ::/0                 fd4d:6169:6c63:6f77::a  tcp dpt:143
    0     0 ACCEPT     6    --  !br-mailcow br-mailcow  ::/0                 fd4d:6169:6c63:6f77::a  tcp dpt:110
    0     0 DROP       0    --  !docker0 docker0  ::/0                 ::/0
    0     0 DROP       0    --  !br-mailcow br-mailcow  ::/0                 ::/0

Chain DOCKER-BRIDGE (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER     0    --  *      docker0  ::/0                 ::/0
    0     0 DOCKER     0    --  *      br-mailcow  ::/0                 ::/0

Chain DOCKER-CT (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 ACCEPT     0    --  *      docker0  ::/0                 ::/0                 ctstate RELATED,ESTABLISHED
    0     0 ACCEPT     0    --  *      br-mailcow  ::/0                 ::/0                 ctstate RELATED,ESTABLISHED

Chain DOCKER-FORWARD (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER-CT  0    --  *      *       ::/0                 ::/0
    0     0 DOCKER-ISOLATION-STAGE-1  0    --  *      *       ::/0                 ::/0
    0     0 DOCKER-BRIDGE  0    --  *      *       ::/0                 ::/0
    0     0 ACCEPT     0    --  docker0 *       ::/0                 ::/0
    0     0 ACCEPT     0    --  br-mailcow *       ::/0                 ::/0

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER-ISOLATION-STAGE-2  0    --  docker0 !docker0  ::/0                 ::/0
    0     0 DOCKER-ISOLATION-STAGE-2  0    --  br-mailcow !br-mailcow  ::/0                 ::/0

Chain DOCKER-ISOLATION-STAGE-2 (2 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DROP       0    --  *      br-mailcow  ::/0                 ::/0
    0     0 DROP       0    --  *      docker0  ::/0                 ::/0

Chain DOCKER-USER (1 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 RETURN     0    --  *      *       ::/0                 ::/0

Chain MAILCOW (1 references)
 pkts bytes target     prot opt in     out     source               destination
root@mail:/opt/mailcow-dockerized#

Logs of iptables -L -vn -t nat:

root@mail:/opt/mailcow-dockerized# iptables -L -vn -t nat
Chain PREROUTING (policy ACCEPT 2215 packets, 142K bytes)
 pkts bytes target     prot opt in     out     source               destination
   29  1760 DOCKER     0    --  *      *       0.0.0.0/0            0.0.0.0/0            ADDRTYPE match dst-type LOCAL

Chain INPUT (policy ACCEPT 14 packets, 860 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 649 packets, 41022 bytes)
 pkts bytes target     prot opt in     out     source               destination
    1    60 DOCKER     0    --  *      *       0.0.0.0/0           !127.0.0.0/8          ADDRTYPE match dst-type LOCAL

Chain POSTROUTING (policy ACCEPT 650 packets, 41082 bytes)
 pkts bytes target     prot opt in     out     source               destination
  510 32588 MASQUERADE  0    --  *      !br-mailcow  172.22.1.0/24        0.0.0.0/0
    0     0 MASQUERADE  0    --  *      !docker0  172.17.0.0/16        0.0.0.0/0
    0     0 MASQUERADE  6    --  *      *       172.22.1.0/24        0.0.0.0/0            tcp dpt:25
    0     0 MASQUERADE  0    --  *      ens18   192.168.100.131      0.0.0.0/0

Chain DOCKER (2 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 RETURN     0    --  br-mailcow *       0.0.0.0/0            0.0.0.0/0
    0     0 RETURN     0    --  docker0 *       0.0.0.0/0            0.0.0.0/0
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            127.0.0.1            tcp dpt:7654 to:172.22.1.249:6379
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            127.0.0.1            tcp dpt:13306 to:172.22.1.5:3306
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            0.0.0.0/0            tcp dpt:110 to:172.22.1.250:110
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            0.0.0.0/0            tcp dpt:143 to:172.22.1.250:143
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            0.0.0.0/0            tcp dpt:993 to:172.22.1.250:993
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            0.0.0.0/0            tcp dpt:995 to:172.22.1.250:995
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            0.0.0.0/0            tcp dpt:4190 to:172.22.1.250:4190
    0     0 DNAT       6    --  !br-mailcow *       0.0.0.0/0            127.0.0.1            tcp dpt:19991 to:172.22.1.250:12345
root@mail:/opt/mailcow-dockerized#
root@mail:/opt/mailcow-dockerized# cp /opt/mailcow-dockerized/docker-compose.yml docker-compose.back.yaml
r

Logs of ip6tables -L -vn -t nat:

root@mail:/opt/mailcow-dockerized#  ip6tables -L -vn -t nat
Chain PREROUTING (policy ACCEPT 461 packets, 40867 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER     0    --  *      *       ::/0                 ::/0                 ADDRTYPE match dst-type LOCAL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DOCKER     0    --  *      *       ::/0                !::1                  ADDRTYPE match dst-type LOCAL

Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 MASQUERADE  0    --  *      !br-mailcow  fd4d:6169:6c63:6f77::/64  ::/0
    0     0 MASQUERADE  0    --  *      !docker0  fd00:dead:beef:c0::/80  ::/0

Chain DOCKER (2 references)
 pkts bytes target     prot opt in     out     source               destination
    0     0 RETURN     0    --  br-mailcow *       ::/0                 ::/0
    0     0 RETURN     0    --  docker0 *       ::/0                 ::/0
    0     0 DNAT       6    --  !br-mailcow *      !fe80::/10            ::/0                 tcp dpt:110 to:[fd4d:6169:6c63:6f77::a]:110
    0     0 DNAT       6    --  !br-mailcow *      !fe80::/10            ::/0                 tcp dpt:143 to:[fd4d:6169:6c63:6f77::a]:143
    0     0 DNAT       6    --  !br-mailcow *      !fe80::/10            ::/0                 tcp dpt:993 to:[fd4d:6169:6c63:6f77::a]:993
    0     0 DNAT       6    --  !br-mailcow *      !fe80::/10            ::/0                 tcp dpt:995 to:[fd4d:6169:6c63:6f77::a]:995
    0     0 DNAT       6    --  !br-mailcow *      !fe80::/10            ::/0                 tcp dpt:4190 to:[fd4d:6169:6c63:6f77::a]:4190
root@mail:/opt/mailcow-dockerized#
root@mail:/opt/mailcow-dockerized#
r

DNS check:

root@mail:/opt/mailcow-dockerized# docker exec -it $(docker ps -qf name=acme-mailcow) dig +short stackoverflow.com @172.22.1.254
Error response from daemon: No such container: dig
root@mail:/opt/mailcow-dockerized# docker exec -it $(docker ps -qf name=acme-mailcow)
docker: 'docker exec' requires at least 2 arguments

Usage:  docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

See 'docker exec --help' for more information
root@mail:/opt/mailcow-dockerized# docker exec -it $(docker ps -qf name=acme-mailcow) dig +short stackoverflow.com @172.22.1.254
Error response from daemon: No such container: dig
root@mail:/opt/mailcow-dockerized#

[f0sh]

I have a similar issue with the unbound service where other services cannot use unbound to resolve dns lookups. This is causing, that postfix is rejecting mails.

warning: Unable to look up MX host for google.de: Host not found, try again

However, lookup in unbound works

docker exec -t mailcow-unbound-mailcow-1 dig +trace google.de

; <<>> DiG 9.18.34 <<>> +trace google.de
;; global options: +cmd
.                       8238    IN      NS      k.root-servers.net.
.                       8238    IN      NS      l.root-servers.net.
.                       8238    IN      NS      m.root-servers.net.
.                       8238    IN      NS      a.root-servers.net.
.                       8238    IN      NS      b.root-servers.net.
.                       8238    IN      NS      c.root-servers.net.
.                       8238    IN      NS      d.root-servers.net.
.                       8238    IN      NS      e.root-servers.net.
.                       8238    IN      NS      f.root-servers.net.
.                       8238    IN      NS      g.root-servers.net.
.                       8238    IN      NS      h.root-servers.net.
.                       8238    IN      NS      i.root-servers.net.
.                       8238    IN      NS      j.root-servers.net.
.                       8238    IN      RRSIG   NS 8 0 518400 20250831050000 20250818040000 46441 . Arywi5NLHLMMvGfKJBvq6CPN3b7RKqTeFk0MuC17bhZ8p/pAZjvw+tgk DT5vI4qHFoAvFA4U8fKJph9cOlSHmNWUP778HBKVmQ3KW9o61HxUwpfn oMdAPS9F+VJcwyfcSHUtxl+g8dFmn6C+WJ2isWLH212+v18Zt1tH09ZT F+sbU+dKdRBlGjcbxMmwbrZg7aa/3TC5ZHHa7rmkdT2ONLbK/yhN+0Ms aHr9b4DikJa+fAGdN/EVMy3hH+YFKxsM9fZWR50gp5T9v0KBaJ46JeIJ bC9EzDYdQBbub1YmgWsp+Af01dWNs8z5vMpZb/CRD9nhez9HhLdkhvxw Rbzqgw==
;; Received 525 bytes from 127.0.0.11#53(127.0.0.11) in 40 ms

de.                     172800  IN      NS      n.de.net.
de.                     172800  IN      NS      z.nic.de.
de.                     172800  IN      NS      a.nic.de.
de.                     172800  IN      NS      l.de.net.
de.                     172800  IN      NS      f.nic.de.
de.                     172800  IN      NS      s.de.net.
de.                     86400   IN      DS      26755 8 2 F341357809A5954311CCB82ADE114C6C1D724A75C0395137AA397803 5425E78D
de.                     86400   IN      RRSIG   DS 8 1 86400 20250901050000 20250819040000 46441 . CQXD1kP9ZQER+ptFfpAS/Ir8B3oGc13U9sO793p76S/+Dq84NAzu/+S+ 7fI7yziSwJ8xTwTdPNYY2S6Lyc0jJ8J0JYK2o9BJkrCY4cxtR7WOQSPZ ovc1/1haOHA2ULg3rUR/ZAlt+w+YvGR9bmEMPT9T++SvUsdtcPmcgORQ rNkHVJD+NS1w1KffyDlELtqGZ8gv8P6nDu82chmj2LQ+GHfwYUvwlNCg fqhaPccwS7YYiiLRti1V8CLr1DFclMFeLQxUmUZHUOLf8g0/hqhZR8hZ xRQ0WT39R2r10ongLWJ4ePJ0W8/0ZEJvJCYHSJkvgM8Fzln8H8Pgid2K 9+JRoQ==
;; Received 773 bytes from 2001:500:12::d0d#53(g.root-servers.net) in 4 ms

google.de.              86400   IN      NS      ns1.google.com.
google.de.              86400   IN      NS      ns2.google.com.
google.de.              86400   IN      NS      ns3.google.com.
google.de.              86400   IN      NS      ns4.google.com.
tjlb7qbojvmlf1s6gdriru7vsms1lg16.de. 7200 IN NSEC3 1 1 15 CA12B74ADB90591A TJLCSJAT4LJTVO0TJNCRRDF6KF6ONEFB NS SOA RRSIG DNSKEY NSEC3PARAM
tjlb7qbojvmlf1s6gdriru7vsms1lg16.de. 7200 IN RRSIG NSEC3 8 2 7200 20250827041909 20250813024909 61869 de. S43g1AzvuD8Zt0nUxi2BRlu/3QKMTrc6Lsu/qr2tgP07tJH80YniI1vZ td8hFVFFSxRaorvYWcCLUpvnkdI7jyMqJ/AVWqTS/esXcceCXKbLLrK2 +wATCWs0PXhh4w6OsjnfVZ0kIb9mRHAr0qY54X6BR51kxyJrtCMw/GlB wV0=
0uhcl2sah8felqhujd6pnpd1v05e4oae.de. 7200 IN NSEC3 1 1 15 CA12B74ADB90591A 0UHEFVBKJOLI9EEK3HPBERL0LRKHSASU A RRSIG
0uhcl2sah8felqhujd6pnpd1v05e4oae.de. 7200 IN RRSIG NSEC3 8 2 7200 20250827061831 20250813044831 61869 de. MATjemJELoLNywxbxW5UJNfuVV5tCMkcDqaGGl6CV6dIF8AInzzOkYKT 7ri0NSMKC7qRZhyrTGaRn+mmZi+u/+gSDEkRp68RbnI1CQStjhSDJgxJ +O0E6TYPJDUbGVqSaOrKXQpf3MAxGao8WxBKlJxnitZEtgr7+52YUjol 1Ag=
;; Received 619 bytes from 2001:67c:1011:1::53#53(n.de.net) in 4 ms

google.de.              300     IN      A       142.250.185.67
;; Received 54 bytes from 2001:4860:4802:34::a#53(ns2.google.com) in 24 ms

But in postfix it doesn't:

docker exec -t mailcow-postfix-mailcow-1 dig +trace google.de

; <<>> DiG 9.18.37 <<>> +trace google.de
;; global options: +cmd
;; Received 17 bytes from 127.0.0.11#53(127.0.0.11) in 0 ms

In the docker-compose.yml for the postfix service the dns directive is set:

      dns:
        - ${IPV4_NETWORK:-172.22.1}.254

Removing the unbound service for dns lookups (removing the dns directive in docker-compose.ymland just let postfix itself lookup dns then it works.

docker exec -t mailcow-postfix-mailcow-1 dig +trace google.de

; <<>> DiG 9.18.33-1~deb12u2-Debian <<>> +trace google.de
;; global options: +cmd
.                       7922    IN      NS      j.root-servers.net.
.                       7922    IN      NS      k.root-servers.net.
.                       7922    IN      NS      l.root-servers.net.
.                       7922    IN      NS      m.root-servers.net.
.                       7922    IN      NS      a.root-servers.net.
.                       7922    IN      NS      b.root-servers.net.
.                       7922    IN      NS      c.root-servers.net.
.                       7922    IN      NS      d.root-servers.net.
.                       7922    IN      NS      e.root-servers.net.
.                       7922    IN      NS      f.root-servers.net.
.                       7922    IN      NS      g.root-servers.net.
.                       7922    IN      NS      h.root-servers.net.
.                       7922    IN      NS      i.root-servers.net.
.                       7922    IN      RRSIG   NS 8 0 518400 20250831050000 20250818040000 46441 . Arywi5NLHLMMvGfKJBvq6CPN3b7RKqTeFk0MuC17bhZ8p/pAZjvw+tgk DT5vI4qHFoAvFA4U8fKJph9cOlSHmNWUP778HBKVmQ3KW9o61HxUwpfn oMdAPS9F+VJcwyfcSHUtxl+g8dFmn6C+WJ2isWLH212+v18Zt1tH09ZT F+sbU+dKdRBlGjcbxMmwbrZg7aa/3TC5ZHHa7rmkdT2ONLbK/yhN+0Ms aHr9b4DikJa+fAGdN/EVMy3hH+YFKxsM9fZWR50gp5T9v0KBaJ46JeIJ bC9EzDYdQBbub1YmgWsp+Af01dWNs8z5vMpZb/CRD9nhez9HhLdkhvxw Rbzqgw==
;; Received 525 bytes from 127.0.0.11#53(127.0.0.11) in 16 ms

de.                     172800  IN      NS      a.nic.de.
de.                     172800  IN      NS      f.nic.de.
de.                     172800  IN      NS      l.de.net.
de.                     172800  IN      NS      n.de.net.
de.                     172800  IN      NS      s.de.net.
de.                     172800  IN      NS      z.nic.de.
de.                     86400   IN      DS      26755 8 2 F341357809A5954311CCB82ADE114C6C1D724A75C0395137AA397803 5425E78D
de.                     86400   IN      RRSIG   DS 8 1 86400 20250901050000 20250819040000 46441 . CQXD1kP9ZQER+ptFfpAS/Ir8B3oGc13U9sO793p76S/+Dq84NAzu/+S+ 7fI7yziSwJ8xTwTdPNYY2S6Lyc0jJ8J0JYK2o9BJkrCY4cxtR7WOQSPZ ovc1/1haOHA2ULg3rUR/ZAlt+w+YvGR9bmEMPT9T++SvUsdtcPmcgORQ rNkHVJD+NS1w1KffyDlELtqGZ8gv8P6nDu82chmj2LQ+GHfwYUvwlNCg fqhaPccwS7YYiiLRti1V8CLr1DFclMFeLQxUmUZHUOLf8g0/hqhZR8hZ xRQ0WT39R2r10ongLWJ4ePJ0W8/0ZEJvJCYHSJkvgM8Fzln8H8Pgid2K 9+JRoQ==
;; Received 743 bytes from 199.7.91.13#53(d.root-servers.net) in 4 ms

google.de.              86400   IN      NS      ns1.google.com.
google.de.              86400   IN      NS      ns2.google.com.
google.de.              86400   IN      NS      ns3.google.com.
google.de.              86400   IN      NS      ns4.google.com.
tjlb7qbojvmlf1s6gdriru7vsms1lg16.de. 7200 IN NSEC3 1 1 15 CA12B74ADB90591A TJLCSJAT4LJTVO0TJNCRRDF6KF6ONEFB NS SOA RRSIG DNSKEY NSEC3PARAM
0uhcl2sah8felqhujd6pnpd1v05e4oae.de. 7200 IN NSEC3 1 1 15 CA12B74ADB90591A 0UHEFVBKJOLI9EEK3HPBERL0LRKHSASU A RRSIG
tjlb7qbojvmlf1s6gdriru7vsms1lg16.de. 7200 IN RRSIG NSEC3 8 2 7200 20250827041909 20250813024909 61869 de. S43g1AzvuD8Zt0nUxi2BRlu/3QKMTrc6Lsu/qr2tgP07tJH80YniI1vZ td8hFVFFSxRaorvYWcCLUpvnkdI7jyMqJ/AVWqTS/esXcceCXKbLLrK2 +wATCWs0PXhh4w6OsjnfVZ0kIb9mRHAr0qY54X6BR51kxyJrtCMw/GlB wV0=
0uhcl2sah8felqhujd6pnpd1v05e4oae.de. 7200 IN RRSIG NSEC3 8 2 7200 20250827061831 20250813044831 61869 de. MATjemJELoLNywxbxW5UJNfuVV5tCMkcDqaGGl6CV6dIF8AInzzOkYKT 7ri0NSMKC7qRZhyrTGaRn+mmZi+u/+gSDEkRp68RbnI1CQStjhSDJgxJ +O0E6TYPJDUbGVqSaOrKXQpf3MAxGao8WxBKlJxnitZEtgr7+52YUjol 1Ag=
;; Received 619 bytes from 81.91.164.5#53(f.nic.de) in 4 ms

google.de.              300     IN      A       172.217.16.131
;; Received 54 bytes from 216.239.38.10#53(ns4.google.com) in 4 ms

But not really sure, if it is related to the upper bug report. I am using the same versions for docker, mailcow on a fresh install. So maybe it is timely related.

[andrepadez]

I've been trying to set mailcow-dockerized on Ubuntu 24.04 and i also always get this error

[blahajgoblin]

Same here!

root@echo ~# cd /opt/mailcow-dockerized/
root@echo /o/mailcow-dockerized (master)# docker compose exec unbound-mailcow /bin/bash
6fb27375ff6b:/# ping google.com
PING google.com (172.217.18.14): 56 data bytes
64 bytes from 172.217.18.14: seq=0 ttl=114 time=1.700 ms
64 bytes from 172.217.18.14: seq=2 ttl=114 time=1.740 ms
^C
--- google.com ping statistics ---
3 packets transmitted, 2 packets received, 33% packet loss
round-trip min/avg/max = 1.700/1.720/1.740 ms
6fb27375ff6b:/# ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=54 time=2.040 ms
64 bytes from 1.1.1.1: seq=2 ttl=54 time=1.940 ms
^C
--- 1.1.1.1 ping statistics ---
3 packets transmitted, 2 packets received, 33% packet loss
round-trip min/avg/max = 1.940/1.990/2.040 ms

6fb27375ff6b:/# ./healthcheck.sh 
2025-08-21 18:14:12: Healthcheck: Failed to ping 1.1.1.1 on attempt 1. Trying again...
2025-08-21 18:14:15: Healthcheck: Failed to ping 1.1.1.1 on attempt 2. Trying again...
2025-08-21 18:14:18: Healthcheck: Failed to ping 1.1.1.1 on attempt 3. Trying again...
2025-08-21 18:14:18: Healthcheck: Couldn't ping 1.1.1.1 after 3 attempts. Marking this IP as failed.
^C2025-08-21 18:14:19: Healthcheck: Failed to ping 8.8.8.8 on attempt 1. Trying again...
2025-08-21 18:14:22: Healthcheck: Failed to ping 8.8.8.8 on attempt 2. Trying again...
2025-08-21 18:14:25: Healthcheck: Failed to ping 8.8.8.8 on attempt 3. Trying again...
2025-08-21 18:14:25: Healthcheck: Couldn't ping 8.8.8.8 after 3 attempts. Marking this IP as failed.
2025-08-21 18:14:28: Healthcheck: Failed to ping 9.9.9.9 on attempt 1. Trying again...
2025-08-21 18:14:31: Healthcheck: Failed to ping 9.9.9.9 on attempt 2. Trying again...
2025-08-21 18:14:34: Healthcheck: Failed to ping 9.9.9.9 on attempt 3. Trying again...
2025-08-21 18:14:34: Healthcheck: Couldn't ping 9.9.9.9 after 3 attempts. Marking this IP as failed.
2025-08-21 18:14:34: Healthcheck: Too many ping failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy...
2025-08-21 18:15:07: Healthcheck: Failed to ping 1.1.1.1 on attempt 1. Trying again...
2025-08-21 18:15:10: Healthcheck: Failed to ping 1.1.1.1 on attempt 2. Trying again...
2025-08-21 18:15:13: Healthcheck: Failed to ping 1.1.1.1 on attempt 3. Trying again...
2025-08-21 18:15:13: Healthcheck: Couldn't ping 1.1.1.1 after 3 attempts. Marking this IP as failed.
2025-08-21 18:15:16: Healthcheck: Failed to ping 8.8.8.8 on attempt 1. Trying again...
^C2025-08-21 18:15:17: Healthcheck: Failed to ping 8.8.8.8 on attempt 2. Trying again...
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 8.8.8.8 on attempt 3. Trying again...
2025-08-21 18:15:18: Healthcheck: Couldn't ping 8.8.8.8 after 3 attempts. Marking this IP as failed.
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 9.9.9.9 on attempt 1. Trying again...
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 9.9.9.9 on attempt 2. Trying again...
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 9.9.9.9 on attempt 3. Trying again...
2025-08-21 18:15:18: Healthcheck: Couldn't ping 9.9.9.9 after 3 attempts. Marking this IP as failed.
2025-08-21 18:15:18: Healthcheck: Too many ping failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy...
^C
6fb27375ff6b:/# ^C

I can ping google.com/1.1.1.1/9.9.9.9 on my host system just fine, same goes for inside the unbound container
but it inexplicably broke.

[blahajgoblin]

Okay, so
I'm absolutely losing my freaking mind.

I absolutely could not come close to fixing the issue and since the instance was not extensively used yet, I decided to set it up fresh on a new VPS.
Followed the install guide, set up everything

Aaaaannd...

[+] Running 26/27wdockerized_vmail-vol-1"                 Created                                                                                                   0.0s 
[+] Running 27/28wdockerized_mailcow-network              Created                                                                                                   0.1s 
[+] Running 30/30wdockerized_mailcow-network              Created                                                                                                   0.1s 
 ✔ Network mailcowdockerized_mailcow-network              Created                                                                                                   0.1s 
 ✔ Volume "mailcowdockerized_postfix-vol-1"               Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_vmail-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_sogo-web-vol-1"              Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_redis-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_rspamd-vol-1"                Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_mysql-socket-vol-1"          Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_clamd-db-vol-1"              Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_mysql-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_crypt-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_vmail-index-vol-1"           Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_sogo-userdata-backup-vol-1"  Created                                                                                                   0.0s 
 ✔ Container mailcowdockerized-dockerapi-mailcow-1        Started                                                                                                   2.3s 
 ✔ Container mailcowdockerized-olefy-mailcow-1            Started                                                                                                   2.9s 
 ✔ Container mailcowdockerized-netfilter-mailcow-1        Started                                                                                                   1.5s 
 ✔ Container mailcowdockerized-sogo-mailcow-1             Started                                                                                                   2.3s 
 ✔ Container mailcowdockerized-memcached-mailcow-1        Started                                                                                                   2.0s 
 ✘ Container mailcowdockerized-unbound-mailcow-1          Error                                                                                                    93.4s 
 ✔ Container mailcowdockerized-clamd-mailcow-1            Created                                                                                                   0.2s 
 ✔ Container mailcowdockerized-redis-mailcow-1            Started                                                                                                   2.8s 
 ✔ Container mailcowdockerized-mysql-mailcow-1            Started                                                                                                   3.1s 
 ✔ Container mailcowdockerized-postfix-mailcow-1          Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-php-fpm-mailcow-1          Started                                                                                                   3.4s 
 ✔ Container mailcowdockerized-dovecot-mailcow-1          Started                                                                                                   3.9s 
 ✔ Container mailcowdockerized-ofelia-mailcow-1           Started                                                                                                   4.1s 
 ✔ Container mailcowdockerized-rspamd-mailcow-1           Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-nginx-mailcow-1            Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-acme-mailcow-1             Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-watchdog-mailcow-1         Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-ipv6nat-mailcow-1          Created                                                                                                   0.1s 
dependency failed to start: container mailcowdockerized-unbound-mailcow-1 is unhealthy
root@mail /o/mailcow-dockerized (master) [1]# docker logs mailcowdockerized-unbound-mailcow-1 
Setting console permissions...
Receiving anchor key...
Receiving root hints...
######################################################################## 100.0%
setup in directory /etc/unbound
Certificate request self-signature ok
subject=CN=unbound-control
removing artifacts
Setup success. Certificates created. Enable in unbound.conf file to use
2025-08-21 19:37:59,938 INFO Set uid to user 0 succeeded
2025-08-21 19:37:59,945 INFO supervisord started with pid 1
2025-08-21 19:38:00,951 INFO spawned: 'processes' with pid 23
2025-08-21 19:38:00,954 INFO spawned: 'syslog-ng' with pid 24
2025-08-21 19:38:00,957 INFO spawned: 'unbound' with pid 25
2025-08-21 19:38:00,959 INFO spawned: 'unbound-healthcheck' with pid 26
[1755797880] unbound[25:0] notice: init module 0: subnetcache
[1755797880] unbound[25:0] notice: init module 1: validator
[1755797880] unbound[25:0] notice: init module 2: iterator
Aug 21 19:38:00 06b173d8c17b syslog-ng[24]: syslog-ng starting up; version='4.8.1'
[1755797880] unbound[25:0] info: start of service (unbound 1.22.0).
2025-08-21 19:38:01,980 INFO success: processes entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2025-08-21 19:38:01,980 INFO success: syslog-ng entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2025-08-21 19:38:01,980 INFO success: unbound entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2025-08-21 19:38:01,980 INFO success: unbound-healthcheck entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2025-08-21 19:38:03: Healthcheck: Failed to ping 1.1.1.1 on attempt 1. Trying again...
[1755797886] unbound[25:0] info: generate keytag query _ta-4f66-9728. NULL IN
2025-08-21 19:38:06: Healthcheck: Failed to ping 1.1.1.1 on attempt 2. Trying again...
2025-08-21 19:38:09: Healthcheck: Failed to ping 1.1.1.1 on attempt 3. Trying again...
2025-08-21 19:38:09: Healthcheck: Couldn't ping 1.1.1.1 after 3 attempts. Marking this IP as failed.
2025-08-21 19:38:12: Healthcheck: Failed to ping 8.8.8.8 on attempt 1. Trying again...
2025-08-21 19:38:15: Healthcheck: Failed to ping 8.8.8.8 on attempt 2. Trying again...
2025-08-21 19:38:18: Healthcheck: Failed to ping 8.8.8.8 on attempt 3. Trying again...
2025-08-21 19:38:18: Healthcheck: Couldn't ping 8.8.8.8 after 3 attempts. Marking this IP as failed.
2025-08-21 19:38:22: Healthcheck: Failed to ping 9.9.9.9 on attempt 1. Trying again...
2025-08-21 19:38:25: Healthcheck: Failed to ping 9.9.9.9 on attempt 2. Trying again...
2025-08-21 19:38:28: Healthcheck: Failed to ping 9.9.9.9 on attempt 3. Trying again...
2025-08-21 19:38:28: Healthcheck: Couldn't ping 9.9.9.9 after 3 attempts. Marking this IP as failed.
2025-08-21 19:38:28: Healthcheck: Too many ping failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy...
2025-08-21 19:39:01: Healthcheck: Failed to ping 1.1.1.1 on attempt 1. Trying again...
2025-08-21 19:39:04: Healthcheck: Failed to ping 1.1.1.1 on attempt 2. Trying again...
2025-08-21 19:39:07: Healthcheck: Failed to ping 1.1.1.1 on attempt 3. Trying again...
2025-08-21 19:39:07: Healthcheck: Couldn't ping 1.1.1.1 after 3 attempts. Marking this IP as failed.
2025-08-21 19:39:10: Healthcheck: Failed to ping 8.8.8.8 on attempt 1. Trying again...
2025-08-21 19:39:13: Healthcheck: Failed to ping 8.8.8.8 on attempt 2. Trying again...
2025-08-21 19:39:16: Healthcheck: Failed to ping 8.8.8.8 on attempt 3. Trying again...
2025-08-21 19:39:16: Healthcheck: Couldn't ping 8.8.8.8 after 3 attempts. Marking this IP as failed.
2025-08-21 19:39:19: Healthcheck: Failed to ping 9.9.9.9 on attempt 1. Trying again...
2025-08-21 19:39:22: Healthcheck: Failed to ping 9.9.9.9 on attempt 2. Trying again...
2025-08-21 19:39:25: Healthcheck: Failed to ping 9.9.9.9 on attempt 3. Trying again...
2025-08-21 19:39:25: Healthcheck: Couldn't ping 9.9.9.9 after 3 attempts. Marking this IP as failed.
2025-08-21 19:39:25: Healthcheck: Too many ping failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy...
root@mail /o/mailcow-dockerized (master)# 

I am running a fresh instance of Ubuntu Server 2024.04
There have been no changes to any of the configs/files - this was the first attempt of trying to deploy it.
I am going insane.

[blahajgoblin]

This is seriously just... weird
Fresh Debian 12 install on a hosting provider I've been using to host mail for ages.

root@mail ~# cd /opt
             git clone https://github.com/mailcow/mailcow-dockerized
             cd mailcow-dockerized
Cloning into 'mailcow-dockerized'...
remote: Enumerating objects: 57218, done.
remote: Counting objects: 100% (376/376), done.
remote: Compressing objects: 100% (192/192), done.
remote: Total 57218 (delta 254), reused 234 (delta 181), pack-reused 56842 (from 2)
Receiving objects: 100% (57218/57218), 48.09 MiB | 30.83 MiB/s, done.
Resolving deltas: 100% (38063/38063), done.
root@mail /o/mailcow-dockerized (master)# ./generate_config.sh
Found Docker Compose Plugin (native).
Setting the DOCKER_COMPOSE_VERSION Variable to native
Notice: You'll have to update this Compose Version via your Package Manager manually!
Press enter to confirm the detected value '[value]' where applicable or enter a custom value.
Mail server hostname (FQDN) - this is not your mail domain, but your mail servers hostname: mail.shork.eu
Timezone [Europe/Berlin]: 
Which branch of mailcow do you want to use?

Available Branches:
- master branch (stable updates) | default, recommended [1]
- nightly branch (unstable updates, testing) | not-production ready [2]
- legacy branch (supported until February 2026) | deprecated, security updates only [3]
Choose the Branch with it's number [1/2/3] 1
Already on 'master'
Your branch is up to date with 'origin/master'.
Generating snake-oil certificate...
...+......+..+.........+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*..+......+...+....+..+.........+....+......+.........+..+....+.....+.......+...+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.......+....+...+...+.....+.......+.....+......+.+.....+.............+.....+............+.+........+......+..................+.+.........+.....+.+.....+.........+......+.+......+..+...+....+......+.....+..........+.....+...+..........+.........+..+..........+........+............+....+.....+..........+......+........................+...........+..........+...+......+.....+.+........+..........+...+..+.......+......+..+.+.....+.....................+......+.......+...+..+.......+.........+.....+.+.............................+.+........+......+.+...+..+...............+.........+.........+.......+........+..........+......+..+....+.........+...........+...+.......+...+..+...+...+......................+.....+..........+..+....+...............+..+...+................+......+..+...+..........+..+...+....+...+...+...............................................+...+....+.....+...+.......+.....+...+............+......+....+...+........+..........+............+.....+.+..+...+.+......+...+..+....+...+......+............+..+.....................+............+.........+......+....+...+........+....+..............+....+..+...+.............+............+........+......................+..+.............+..+....+.............................+.+...........+...+...............+............+................+...+......+.....+.........+.......+...+......+...+...+..+.+.....+............+...+.....................+....+.........+..+......+......................+......+.....+.+...+......+......+.....+...+..........+........+.......+......+..+.............+..+.........+......+....+...+...+...............+..+............+......+...............+....+...+...+.................+..........+..+.............+...+........+.+......+..............+....+..+....+........................+..............+.....................+.........+.......+...+..+..........+.........+.........+..+.+........+.+..............+.......+..+............................+........+.......+..+......+.......+.........+........+......+...................+.....+...............+...+..........+.........+.....+...+......+.+.........+.....+.+...+...+..+.............+............+..+...+...............+......+.+...+......+..+...+.........................+..+............+...+.......+...+.....+............+.......+..............+..........+..+.............+.....+.......+.....+.........+...+......+......+.........+........................+.+......+...+........+....+.....+.+...+............+.....+.......+.....................+..+.......+...+....................+.......+....................+...............+.+......+......+........+.........................+.........+............+........+...+...+......+...............+.+.....+...+......+......+......................+.....+............+...+.......+........+.+....................+.+........+.+.....+....+...+.....+.............+.....+....+.......................+.......+...+.....+.......+..+.+...+............+..+.+..+....+...............+...+..+.........+......+......+.............+............+..+.......+...+...........+.+...........+...+.......+....................+..........+.................+...+....+........+..........+...........+.+.........+..+...+......+..........+...+..+......+..........+...+..............+.......+..................+.................+...+.+............+..+................+.........+...+...+..+....+.....+.............+.....+......+.+...+...........................+......+............+........+.............+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
....+.+......+..+.+...........+.+.........+...+......+..............+...+....+.....+......+.......+.....+.......+.....+...+.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.....+.+...+...+..............+.+..+...+.......+...........+.+......+........+.......+..+......+..........+..+....+......+.........+...+..+.+........+......+.............+..+....+..+....+...........+............+......+......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*..........+..............+.........+...+.............+.....+............+....+...+...+...+.....+.....................+.+........+............+...+......+....+......+.........+..+....+...+......+..+...+....+.....+.......+.....+.+........+.........+...+.........+.........+....+..+......+.......+..+......+..........+..+...............+.......+.....+....+..+............+.....................+......+.+.......................+....+..........................+............+....+...+...+............+...+..............+...+.+......+.........+......+...+.....+...+............+.+.....................+..............+............+.......+...+...+......+..............+....+...............+..+...+.......+..............+.+................................................+..+...+...+..........+.....+...+.+......+...+............+...+..+...+....+..+.+...........................+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----
Copying snake-oil certificate...
Detecting if your IP is listed on Spamhaus Bad ASN List...
Check completed! Your IP is clean
root@mail /o/mailcow-dockerized (master)# vim mailcow.conf 
root@mail /o/mailcow-dockerized (master)# vim docker-compose.yml 
root@mail /o/mailcow-dockerized (master)# docker compose pull
                                          docker compose up -d
[+] Pulling 153/153
 ✔ sogo-mailcow Pulled                                                                                                                                             26.2s 
 ✔ ipv6nat-mailcow Pulled                                                                                                                                          25.8s 
 ✔ dockerapi-mailcow Pulled                                                                                                                                        14.7s 
 ✔ unbound-mailcow Pulled                                                                                                                                          25.9s 
 ✔ dovecot-mailcow Pulled                                                                                                                                          31.3s 
 ✔ redis-mailcow Pulled                                                                                                                                            28.9s 
 ✔ acme-mailcow Pulled                                                                                                                                             12.0s 
 ✔ postfix-mailcow Pulled                                                                                                                                          31.1s 
 ✔ netfilter-mailcow Pulled                                                                                                                                        24.6s 
 ✔ mysql-mailcow Pulled                                                                                                                                            29.0s 
 ✔ clamd-mailcow Pulled                                                                                                                                             3.1s 
 ✔ php-fpm-mailcow Pulled                                                                                                                                          11.9s 
 ✔ nginx-mailcow Pulled                                                                                                                                            21.7s 
 ✔ watchdog-mailcow Pulled                                                                                                                                          6.8s 
 ✔ ofelia-mailcow Pulled                                                                                                                                           26.4s 
 ✔ olefy-mailcow Pulled                                                                                                                                            18.8s 
 ✔ rspamd-mailcow Pulled                                                                                                                                           23.8s 
 ✔ memcached-mailcow Pulled                                                                                                                                        27.9s 
                                                                                                                                                                                                                                                                                                                                  
[+] Running 4/5
[+] Running 12/18wdockerized_mailcow-network     Created                                                                                                            0.1s 
[+] Running 18/21wdockerized_mailcow-network              Created                                                                                                   0.1s 
 ✔ Network mailcowdockerized_mailcow-network              Created                                                                                                   0.1s 
 ✔ Volume "mailcowdockerized_vmail-vol-1"                 Created                                                                                                   0.0s 
[+] Running 26/27wdockerized_sogo-web-vol-1"              Created                                                                                                   0.0s 
[+] Running 27/28wdockerized_mailcow-network              Created                                                                                                   0.1s 
[+] Running 30/30wdockerized_mailcow-network              Created                                                                                                   0.1s 
 ✔ Network mailcowdockerized_mailcow-network              Created                                                                                                   0.1s 
 ✔ Volume "mailcowdockerized_vmail-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_sogo-web-vol-1"              Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_rspamd-vol-1"                Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_vmail-index-vol-1"           Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_clamd-db-vol-1"              Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_mysql-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_redis-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_postfix-vol-1"               Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_mysql-socket-vol-1"          Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_crypt-vol-1"                 Created                                                                                                   0.0s 
 ✔ Volume "mailcowdockerized_sogo-userdata-backup-vol-1"  Created                                                                                                   0.0s 
 ✔ Container mailcowdockerized-memcached-mailcow-1        Started                                                                                                   1.8s 
 ✔ Container mailcowdockerized-olefy-mailcow-1            Started                                                                                                   1.9s 
 ✘ Container mailcowdockerized-unbound-mailcow-1          Error                                                                                                    92.0s 
 ✔ Container mailcowdockerized-netfilter-mailcow-1        Started                                                                                                   1.1s 
 ✔ Container mailcowdockerized-dockerapi-mailcow-1        Started                                                                                                   1.9s 
 ✔ Container mailcowdockerized-sogo-mailcow-1             Started                                                                                                   1.3s 
 ✔ Container mailcowdockerized-redis-mailcow-1            Started                                                                                                   2.0s 
 ✔ Container mailcowdockerized-mysql-mailcow-1            Started                                                                                                   2.0s 
 ✔ Container mailcowdockerized-clamd-mailcow-1            Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-php-fpm-mailcow-1          Started                                                                                                   3.1s 
 ✔ Container mailcowdockerized-dovecot-mailcow-1          Started                                                                                                   3.0s 
 ✔ Container mailcowdockerized-postfix-mailcow-1          Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-ofelia-mailcow-1           Started                                                                                                   3.3s 
 ✔ Container mailcowdockerized-rspamd-mailcow-1           Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-nginx-mailcow-1            Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-acme-mailcow-1             Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-watchdog-mailcow-1         Created                                                                                                   0.1s 
 ✔ Container mailcowdockerized-ipv6nat-mailcow-1          Created                                                                                                   0.1s 
dependency failed to start: container mailcowdockerized-unbound-mailcow-1 is unhealthy

The same logs for docker logs mailcowdockerized-unbound-mailcow-1 as before.

[milkmaker]

THIS IS A AUTOMATED MESSAGE!

It seems your issue is not a bug.
Therefore we highly advise you to get support!

You can get support either by:

• ordering a paid support contract at Servercow (Directly from the developers) or
• using the community forum (Based on volunteers! NO guaranteed answer) or
• using the Telegram support channel (Based on volunteers! NO guaranteed answer)

This issue will be closed. If you think your reported issue is not a support case feel free to comment above and if so the issue will reopened.

[Trackhe]

perfect ignored again :D nice

but i found a good solution i guess. change unbound config in '/opt/mailcow-dockerized/data/conf/unbound/unbound.conf'
add your docker network ip range between

access-control: 172.16.0.0/12 allow
#add my docker network
access-control: 172.32.0.0/12 allow

found it here: https://community.mailcow.email/d/2977-container-unbound-unhealthy/49

[da-wilky]

Same here!

root@echo ~# cd /opt/mailcow-dockerized/
root@echo /o/mailcow-dockerized (master)# docker compose exec unbound-mailcow /bin/bash
6fb27375ff6b:/# ping google.com
PING google.com (172.217.18.14): 56 data bytes
64 bytes from 172.217.18.14: seq=0 ttl=114 time=1.700 ms
64 bytes from 172.217.18.14: seq=2 ttl=114 time=1.740 ms
^C
--- google.com ping statistics ---
3 packets transmitted, 2 packets received, 33% packet loss
round-trip min/avg/max = 1.700/1.720/1.740 ms
6fb27375ff6b:/# ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=54 time=2.040 ms
64 bytes from 1.1.1.1: seq=2 ttl=54 time=1.940 ms
^C
--- 1.1.1.1 ping statistics ---
3 packets transmitted, 2 packets received, 33% packet loss
round-trip min/avg/max = 1.940/1.990/2.040 ms

6fb27375ff6b:/# ./healthcheck.sh 
2025-08-21 18:14:12: Healthcheck: Failed to ping 1.1.1.1 on attempt 1. Trying again...
2025-08-21 18:14:15: Healthcheck: Failed to ping 1.1.1.1 on attempt 2. Trying again...
2025-08-21 18:14:18: Healthcheck: Failed to ping 1.1.1.1 on attempt 3. Trying again...
2025-08-21 18:14:18: Healthcheck: Couldn't ping 1.1.1.1 after 3 attempts. Marking this IP as failed.
^C2025-08-21 18:14:19: Healthcheck: Failed to ping 8.8.8.8 on attempt 1. Trying again...
2025-08-21 18:14:22: Healthcheck: Failed to ping 8.8.8.8 on attempt 2. Trying again...
2025-08-21 18:14:25: Healthcheck: Failed to ping 8.8.8.8 on attempt 3. Trying again...
2025-08-21 18:14:25: Healthcheck: Couldn't ping 8.8.8.8 after 3 attempts. Marking this IP as failed.
2025-08-21 18:14:28: Healthcheck: Failed to ping 9.9.9.9 on attempt 1. Trying again...
2025-08-21 18:14:31: Healthcheck: Failed to ping 9.9.9.9 on attempt 2. Trying again...
2025-08-21 18:14:34: Healthcheck: Failed to ping 9.9.9.9 on attempt 3. Trying again...
2025-08-21 18:14:34: Healthcheck: Couldn't ping 9.9.9.9 after 3 attempts. Marking this IP as failed.
2025-08-21 18:14:34: Healthcheck: Too many ping failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy...
2025-08-21 18:15:07: Healthcheck: Failed to ping 1.1.1.1 on attempt 1. Trying again...
2025-08-21 18:15:10: Healthcheck: Failed to ping 1.1.1.1 on attempt 2. Trying again...
2025-08-21 18:15:13: Healthcheck: Failed to ping 1.1.1.1 on attempt 3. Trying again...
2025-08-21 18:15:13: Healthcheck: Couldn't ping 1.1.1.1 after 3 attempts. Marking this IP as failed.
2025-08-21 18:15:16: Healthcheck: Failed to ping 8.8.8.8 on attempt 1. Trying again...
^C2025-08-21 18:15:17: Healthcheck: Failed to ping 8.8.8.8 on attempt 2. Trying again...
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 8.8.8.8 on attempt 3. Trying again...
2025-08-21 18:15:18: Healthcheck: Couldn't ping 8.8.8.8 after 3 attempts. Marking this IP as failed.
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 9.9.9.9 on attempt 1. Trying again...
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 9.9.9.9 on attempt 2. Trying again...
^C2025-08-21 18:15:18: Healthcheck: Failed to ping 9.9.9.9 on attempt 3. Trying again...
2025-08-21 18:15:18: Healthcheck: Couldn't ping 9.9.9.9 after 3 attempts. Marking this IP as failed.
2025-08-21 18:15:18: Healthcheck: Too many ping failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy...
^C
6fb27375ff6b:/# ^C

I can ping google.com/1.1.1.1/9.9.9.9 on my host system just fine, same goes for inside the unbound container but it inexplicably broke.

I have the same problem since the last update. I dont know why, I can ping all those IPs and Hosts successfully from the container, but the healthcheck.sh is failing.

The fix of adding my docker network unfortunatly doesnt work for me.
Any one else having this problem?

[Trackhe]

@da-wilky maybe something there can help you #5649

[da-wilky]

Thanks for the hint!
It seams that this healthcheck is pretty unstable. After one recreation of the container it was working, then again it wasnt for a few restarts and now its working again for the last 5 restarts. I got no clue whats happening. I will keep an eye on this and in case its again permently failing I will disable ipv6 for unbound like suggested at the end of the issue. Thanks for that!