I installed my server with this guide: https://www.howtoforge.com/tutorial/perfect-server-debian-jessie-nginx-bind-dovecot-ispconfig-3.1/ I installed PHP-7.1 with this guide: https://www.howtoforge.com/tutorial/how-to-install-php-7-on-debian/ When I switch sites between PHP5-FPM and PHP7-FPM sites the PHP7 will begin to give an error. 502 BAD GATEWAY When I try to restart PHP7 I get this: Code: [email protected]:/opt/php-7.1/etc/php-fpm.d# /etc/init.d/php-7.1-fpm restart Gracefully shutting down php-fpm /etc/init.d/php-7.1-fpm: line 59: kill: (29208) - No such process ................................... failed. Use force-exit Starting php-fpm [27-Oct-2017 08:52:11] ERROR: unable to bind listening socket for address '127.0.0.1:9114': Address already in use (98) [27-Oct-2017 08:52:11] ERROR: FPM initialization failed failed The only way I can get things working again is to stop and start PHP5-FPM (restart does not work) then restarting PHP7-FPM. It seems the web100.conf just gets copied from /etc/php5/fpm/pool.d/ to /opt/php-7.1/etc/php-fpm.d/ but the port number does not stop being served by the old PHP version until you stop and restart the old PHP version. Is there any fix for this?