Sites that use the same PHP-FPM version (for example, 7.2 are not working):
503 service unavailable
The following error appears in the domain's error log
[proxy_fcgi:error] [pid 15605:tid 140353550149376] [client 203.0.113.2:45388] AH01079: failed to make connection to backend: httpd-UDS
[proxy:error] [pid 15605:tid 140353373902592] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/www/vhosts/system/example.com/php-fpm.sock (*) failed
/var/www/vhosts/system/example.com/php-fpm.sockdoes not exist and switching PHP handler to another one at Plesk > Domains > example.com > PHP Settings recreates it, but switching PHP handler back removes it again
Stuck or terminated PHP-FPM service.
Login to the server via SSH
Restart PHP-FPM service that is used by domains:
# service plesk-phpXX-fpm restart
Note: Change XX to the corresponding version (e.g.
Recreate sockets by executing the command:
# plesk bin php_settings -u