Website is not accessible after switching from PHP-FPM to FastCGI: ERROR: Service Temporarily Unavailable

Created:

2017-04-06 13:18:30 UTC

Modified:

2017-08-16 17:12:54 UTC

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Website is not accessible after switching from PHP-FPM to FastCGI: ERROR: Service Temporarily Unavailable

Applicable to:

  • Plesk for Linux

Symptoms

If Plesk has a significant time for Apache restart interval, website is not accessible after switching from PHP-FPM to FastCGI:

Service Temporarily Unavailable

The following error can be found in domains /var/log/httpd/error_log file:

ERROR: An another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock 
ERROR: FPM initialization failed

Cause

This is a bug with ID #PPPM-6028 which will be fixed in future Plesk updates.

Resolution

As a workaround, set restart interval Apache restart interval at Home > Tools & Settings > Apache Web Server Settings to 0 and enable graceful restart.

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