Wont bind to IPv4 if IPv6 enabled #19987
Description
Description
PHP-FPM can't listen to IPv4 and IPv6 simultaneously due to this old bug report from 2019: Bug #74166 IPv6 forced to be enabled
The listen parameter can be set for all IPv4 and IP6 addresses as follows:
IPv4 only
Configuration:
[www]
listen = 0.0.0.0:9000
Result:
# podman exec -it test_testcontainer_phpfpm /bin/sh
/var/www/html # netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:9000 0.0.0.0:* LISTEN 1/php-fpm: master p
-> ✅ working as expected
IPv6 only
Configuration:
[www]
listen = [::]:9000
Result:
# podman exec -it test_testcontainer_phpfpm /bin/sh
/var/www/html # netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp6 0 0 :::9000 :::* LISTEN 1/php-fpm: master p
-> ✅ working as expected
IPv4 and IPv6
Configuration:
[www]
listen = 9000
Result:
# podman exec -it test_testcontainer_phpfpm /bin/sh
/var/www/html # netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp6 0 0 :::9000 :::* LISTEN 1/php-fpm: master p
-> ❌ IPv6 only, IPv4 is missing
I also tested two listen entries for IPv4 and IPv6, but the last listen parameter seems to override the first one.
This also relates to #11593
PHP Version
PHP 8.4.13 (cli) (built: Sep 25 2025 21:17:05) (NTS)
Copyright (c) The PHP Group
Built by https://github.com/docker-library/php
Zend Engine v4.4.13, Copyright (c) Zend Technologies
with Zend OPcache v8.4.13, Copyright (c), by Zend Technologies
Operating System
Official Docker container php:8.4.13-fpm-alpine3.22 with Podman instead of Docker