Cobra Forum

Symptoms

• Website becomes unavailable after switching to FPM application served by Apache
• When the PHP version to another one and then back to the initial PHP version the website works again
• In the corresponding /var/log/plesk-phpXX-fpm/error.log the following errors appear despite the fact that the service is running and the website is accessible:

ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
Cause
The php-fpm.sock file of the affected domain is corrupted

Resolution

• Delete the php-fpm.sock file, it will be recreated automatically:
• Connect to the server via SSH

Execute the following command:

#rm -rf /var/www/vhosts/system/example.com/php-fpm.sock