Apparently php5-fpm does not get killed correctly when used as;
ISPConfig uses that command to refresh when needed, which result in 500 server errors every time you change a related configuration
I found that this command does not have that problem.
so I edit /usr/local/ispconfig/server/plugins-available/apache2_plugin.inc.php and change every invocation of
I'm running the latest Ubuntu 12.04, the latest PHP55 from https://debphp.org
with the latest ISPConfig.