When I try to start either php5-fpm or php-7.1-fpm once the other is running I get an error: php-fpm: [12-Jan-2018 02:19:02] ERROR: An another FPM instance seems to already listen on /var/lib/php5-fpm/web251.sock What might be strange is that both the generated conf files: /opt/php-7.1/etc/php-fpm.d/web301.conf /etc/php5/fpm/pool.d/web301.conf ... both contain the same content: Code: [web301] listen = /var/lib/php5-fpm/web301.sock listen.owner = web301 listen.group = www-data listen.mode = 0660 ... The php site settings has PHP-FPM default. Shouldn't at least the listen part be different in the configuration files? And why would the same site (web301, but there are other too) have both php-7.1-fpm and php5-fpm configurations? Is it this that occupies the sock and prevents the other start up? The php 7-1 version is added with the following configuration: Path to the PHP-FPM init script /etc/init.d/php-7.1-fpm Path to the php.ini directory /opt/php-7.1/lib Path to the PHP-FPM pool directory /opt/php-7.1/etc/php-fpm.d The php5 is default and I think it should not be added as an additional version. The setup has two servers are replicating and both behaving this way regarding the FPM.