Website is showing the following error:

503 Service Temporarily Unavailable

The following errors are shown in /var/log/plesk/panel.log log file:

[proxy:error] [pid 12966] AH00959: ap_proxy_connect_backend disabling worker for ( for 60s
[proxy_fcgi:error] [pid 12966] [client] AH01079: failed to make connection to backend:, referer:

The website is using PHP-FPM handler at Domains > > PHP Settings

The following errors can be found in the website error_log file at /var/www/vhosts/

[proxy:error] [pid 3838:tid 140126940247808] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/www/vhosts/system/ (*) failed
[proxy_fcgi:error] [pid 3838:tid 140126940247808] [client] AH01079: failed to make connection to backend: httpd-UDS
  1. Connect to the server via SSH
  2. Get the PHP-FPM version assigned to the domain:

plesk db “SELECT,h.php_handler_id FROM domains d JOIN hosting h on WHERE’'”
| name | php_handler_id |
| | plesk-php73-fpm |

Start the PHP-FPM service with the required version. For example the Plesk PHP-FPM 7.3 service:

service plesk-php73-fpm restart

By anup

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