Timeouts on slower connections

[cliffkujala]

What happened?

I am experiencing timeouts when syncing to some of my replicas that are connected via site-to-site VPNs. Most work, but one has a relatively slow connection, and it is timing out.

### Can we adjust the timeout on the sync server?

2025-12-13T20:44:34.068Z	INFO	sync	sync/http.go:26	Starting sync from API	{"remote-addr": "192.168.5.8:39588"}
2025-12-13T20:44:34.121Z	INFO	sync	sync/sync.go:183	Connected to origin	{"from": "adguard.domain.com", "version": "v0.107.71"}
2025-12-13T20:44:34.881Z	INFO	sync	sync/sync.go:291	Start sync	{"from": "adguard.domain.com", "to": "adguard2.domain.com"}
2025-12-13T20:44:34.923Z	INFO	sync	sync/sync.go:312	Connected to replica	{"from": "adguard.domain.com", "to": "adguard2.domain.com", "version": "v0.107.71"}
2025-12-13T20:44:35.161Z	INFO	client	client/client.go:417	Set dns config list	{"host": "adguard2.domain.com"}
2025-12-13T20:44:35.750Z	INFO	client	client/client.go:479	Set TLS config	{"host": "adguard2.domain.com", "enabled": true}
2025-12-13T20:44:35.907Z	INFO	sync	sync/sync.go:301	Sync done	{"from": "adguard.domain.com", "to": "adguard2.domain.com", "duration": "3.6e-08s"}
2025-12-13T20:44:35.907Z	INFO	sync	sync/sync.go:291	Start sync	{"from": "adguard.domain.com", "to": "adguard3.domain.com"}
2025-12-13T20:44:36.077Z	INFO	sync	sync/sync.go:312	Connected to replica	{"from": "adguard.domain.com", "to": "adguard3.domain.com", "version": "v0.107.71"}
2025-12-13T20:44:36.616Z	INFO	client	client/client.go:417	Set dns config list	{"host": "adguard3.domain.com"}
2025-12-13T20:44:37.796Z	INFO	client	client/client.go:479	Set TLS config	{"host": "adguard3.domain.com", "enabled": true}
2025-12-13T20:44:38.016Z	INFO	sync	sync/sync.go:301	Sync done	{"from": "adguard.domain.com", "to": "adguard3.domain.com", "duration": "1.77e-07s"}
2025-12-13T20:44:38.016Z	INFO	sync	sync/sync.go:291	Start sync	{"from": "adguard.domain.com", "to": "adguard4.domain.com"}
2025-12-13T20:44:38.260Z	INFO	sync	sync/sync.go:312	Connected to replica	{"from": "adguard.domain.com", "to": "adguard4.domain.com", "version": "v0.107.71"}
2025-12-13T20:44:38.795Z	INFO	client	client/client.go:417	Set dns config list	{"host": "adguard4.domain.com"}
2025-12-13T20:44:39.674Z	INFO	client	client/client.go:338	Update client settings	{"host": "adguard4.domain.com", "name": "Kids Devices"}
2025-12-13T20:45:00.000Z	INFO	sync	sync/sync.go:154	Sync already running
2025-12-13T20:45:39.653Z	ERROR	sync	sync/action-general.go:155	error updating client setting	{"from": "adguard.domain.com", "to": "adguard4.domain.com", "client-name": "Kids Devices", "error": ": Post \"http://adguard4.domain.com/control/clients/update\": EOF"}
github.com/bakito/adguardhome-sync/internal/sync.init.func11
	/go/src/app/internal/sync/action-general.go:155
github.com/bakito/adguardhome-sync/internal/sync.(*defaultAction).sync
	/go/src/app/internal/sync/action.go:103
github.com/bakito/adguardhome-sync/internal/sync.(*worker).syncTo
	/go/src/app/internal/sync/sync.go:336
github.com/bakito/adguardhome-sync/internal/sync.(*worker).sync
	/go/src/app/internal/sync/sync.go:279
github.com/bakito/adguardhome-sync/internal/sync.(*worker).handleSync
	/go/src/app/internal/sync/http.go:27
github.com/gin-gonic/gin.(*Context).Next
	/go/pkg/mod/github.com/gin-gonic/gin@v1.11.0/context.go:192
github.com/gin-gonic/gin.CustomRecoveryWithWriter.func1
	/go/pkg/mod/github.com/gin-gonic/gin@v1.11.0/recovery.go:92
github.com/gin-gonic/gin.(*Context).Next
	/go/pkg/mod/github.com/gin-gonic/gin@v1.11.0/context.go:192
github.com/gin-gonic/gin.(*Engine).handleHTTPRequest
	/go/pkg/mod/github.com/gin-gonic/gin@v1.11.0/gin.go:689
github.com/gin-gonic/gin.(*Engine).ServeHTTP
	/go/pkg/mod/github.com/gin-gonic/gin@v1.11.0/gin.go:643
net/http.serverHandler.ServeHTTP
	/usr/local/go/src/net/http/server.go:3340
net/http.(*conn).serve
	/usr/local/go/src/net/http/server.go:2109
2025-12-13T20:45:40.056Z	INFO	client	client/client.go:479	Set TLS config	{"host": "adguard4.domain.com", "enabled": true}
2025-12-13T20:45:40.268Z	INFO	sync	sync/sync.go:301	Sync done	{"from": "adguard.domain.com", "to": "adguard4.domain.com", "duration": "1.56e-07s"}

AdguardHome-Sync Version

v0.8.2 (2025-10-24T17:14:03Z)

AdguardHome Version

v0.107.71

OS Information

Debian GNU/Linux 12 (bookworm)/

Configuration

cron: "*/5 * * * *"
runOnStart: true
continueOnError: true
origin:
  url: http://adguard.domain.com
  username: XXXXXXXXX
  password: XXXXXXXXX
replicas:
  - url: http://adguard2.domain.com
    username: XXXXXXXXX
    password: XXXXXXXXX
  - url: http://adguard3.domain.com
    username: XXXXXXXXX
    password: XXXXXXXXX
  - url: http://adguard4.domain.com
    username: XXXXXXXXX
    password: XXXXXXXXX
api:
  port: 8080
  username: XXXXXXXXX
  password: XXXXXXXXX
  darkMode: true
  # metrics:
    # enabled: true
    # scrapeInterval: 30s
    # queryLogLimit: 10000
  # tls:
  #   # the directory of the provided tls certs
  #   certDir: /path/to/certs
  #   # the name of the cert file (default: tls.crt)
  #   certName: foo.crt
  #   # the name of the key file (default: tls.key)
  #   keyName: bar.key
features:
  generalSettings: true
  queryLogConfig: true
  statsConfig: true
  clientSettings: true
  services: true
  filters: true
  tlsConfig: true
  dhcp:
    serverConfig: true
    staticLeases: true
  dns:
    serverConfig: true
    accessLists: true
    rewrites: true

Current Applied Configuration

### AdGuardHome sync unmodified config file

Config file path: /config/adguardhome-sync.yaml



# cron expression to run in daemon mode. (default; "" = runs only once)

cron: "*/5 * * * *"

printConfigOnly: true

# runs the synchronisation on startup

runOnStart: true

# If enabled, the synchronisation task will not fail on single errors, but will log the errors and continue

continueOnError: true

origin:

  # url of the origin instance

  url: http://adguard.domain.com

  # apiPath: define an api path if other than "/control"

  # insecureSkipVerify: true # disable tls check

  username: XXXXXXXXX

  password: XXXXXXXXX

  # cookie: Origin-Cookie-Name=CCCOOOKKKIIIEEE

# replicas instances

�

:

  # url of the replica instance

  - url: http://adguard2.domain.com

    username: XXXXXXXXX

    password: XXXXXXXXX

    # cookie: Replica2-Cookie-Name=CCCOOOKKKIIIEEE

  - url: http://adguard3.domain.com

    username: XXXXXXXXX

    password: XXXXXXXXX

    # cookie: Replica3-Cookie-Name=CCCOOOKKKIIIEEE

  - url: http://adguard4.domain.com

    username: XXXXXXXXX

    password: XXXXXXXXX

    # cookie: Replica4-Cookie-Name=CCCOOOKKKIIIEEE

  #- url: http://192.168.1.4

   # username: username

    #password: password

    # cookie: Replica2-Cookie-Name=CCCOOOKKKIIIEEE

    # autoSetup: true # if true, AdGuardHome is automatically initialized.

    # webURL: "https://some-other.url" # used in the web interface (default: <replica-url>

# Configure the sync API server, disabled if api port is 0

api:

  # Port, default 8080

�
  port: 8080

  # if username and password are defined, basic auth is applied to the sync API

  username: XXXXXXXXX

  password: XXXXXXXXX

  # enable api dark mode

  darkMode: true

  # enable metrics on path '/metrics' (api port must be != 0)

�
  # metrics:

    # enabled: true

    # scrapeInterval: 30s 

    # queryLogLimit: 10000

  # enable tls for the api server

  # tls:

  #   # the directory of the provided tls certs

  #   certDir: /path/to/certs

  #   # the name of the cert file (default: tls.crt)

  #   certName: foo.crt

  #   # the name of the key file (default: tls.key)

  #   keyName: bar.key

# Configure sync features; by default all features are enabled.

�

:

  generalSettings: true

  queryLogConfig: true

  statsConfig: true

  clientSettings: true

  services: true

  filters: true

  tlsConfig: true

  dhcp:

    serverConfig: true

    staticLeases: true

  dns:

    serverConfig: true

    accessLists: true

    rewrites: true



### Environment Variables



   =/opt/go/adguardhome-sync

HOME=/

HOSTNAME=ffa7ccc9180c

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin



<!-- END OF GITHUB ISSUE CONTENT -->

Relevant DEBUG log output

None noted.

Anything else?

No response

[github-actions]

This issue has been inactive for 60 days. If the issue is still relevant please comment to re-activate the issue. If no action is taken within 7 days, the issue will be marked closed.

[bakito]

@cliffkujala the next version will support defining a custom HTTP_CLIENT_TIMEOUT