Directadmin – Proxy Error: DNS lookup failure for php-fpm56 …

If you changed php handler for your Directadmin installation to php-fpm, rewrite all configs and then get error like this:

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /index.php.
Reason: DNS lookup failure for: php-fpm56.domainname

It is almost certainly that apache templates that are used for generating user http configuration files are wrong. Probably you have custom templates.

Go to /usr/local/directadmin/data/templates/custom and check if there are files like files virtual_host2.conf … . If they are, just rename custom directory to something new:

[root@lol ~]# cd /usr/local/directadmin/data/templates/
[root@lol templates]# mv custom custom-bak

Directadmin will then use default templates when creating new Apache configs. Rewrite your apache config files:

[root@lol ~]#  cd /usr/local/directadmin/custombuild
[root@lol custombuild]# ./build rewrite_confs

It should solve the problem. Also, make sure that php-fpm for all php versions are working.

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