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.

Linux: restore all system permissions of your server

If you ever found your self in situation when you accidentally overwrite all permissions of your system, and everything stops working, then solution bellow may do the trick. This CentOS server was overwritten by wrong permissions through the whole system. Quick solution is to set up right permissions back. If you have backup of server that’s great. Otherwise you’ll have to set up new server with similar installation or do this on some other server with similar installation.

On “new” server, copy permissions of the whole system and save it to a file. You can also exclude dirs that you don’t need also.

find / -not -path "/proc*" -not -path "/dev*" -not -path "/sys*" -not -path "/var/www*" -exec stat -c "chmod %a %n;" {} \; > permissions.txt

On your “broken” server, rewrite all permissions:

cat permissions.txt | bash

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