Hello there, I'm facing such a weird problem... I'm moving to ISPConfig, I have it installed on a Debian 8 Jessie in its last version 184.108.40.206p8 with apache2, bind, jailkit, vlogger, postfix, fail2ban... Till now I've just uploaded 2 websites and create 2 limit plans with 2 different clients. Both of the websites are based on symfony2 framework, same version, and I just cant run both at the same time, if I change anything on Sites > Website, the other web stop working throwing an error 500, let's say for example, I go to menu Sites and select web1, change whatever under Web Domain options, no matter whitch tab, and press Save, after a minute web1 starts working and web2 stops, same thing if I do it with web2. Isn't it weird? Both websites are in mod_php, no suExec (changing to suexec makes no diference). The error thrown to the logs in the failing website is a PHP Fatal error: Cannot redeclare class AppKernel in app/AppKernel.php on line 6, whitch make no sense... I have checked both virtualhost and I think its allright... Any help will be highly appreciated. Thanks for reading.