PHP-FPM Config listen directive no longer works with localhost IP after 8.5.2

[MiikaH]

It looks like PHP-FPM starting with 8.5.2 no longer works with listen = 127.0.0.1:9000 config option.

I'm not sure if this is intentional change, but I don't seem to find anything about it in PHP change logs or elsewhere. Took me good while to figure out why upgrading from 8.5.0 to 8.5.4 caused Nginx unable to connect to PHP FPM anymore. Usually semver "patch versions" don't contain breaking changes so that is also making me wonder if this is a bug.

Basically, a www.conf with listen = 127.0.0.1:9000:

• Has worked for years in versions php:8.5.1-fpm and earlier.
• php:8.5.2-fpm - php:8.5.4-fpm it results in Nginx 502 Bad Gateway unless changed to just listen = 9000

[yosifkit]

The listen = 127.0.0.1:9000 should have never worked, since that would prevent other containers from accessing the fpm server. That was being overridden by the listen = 9000 that used to be in zz-docker.conf. This was changed in #1635 (specifically after version 8.5.1 for the 8.5.x series) so that users could more easily override the default listen = 9000 that is now moved to docker.conf.

Duplicate of #1650