Hi, I am running few servers with Nginx, PHP-FPM and ISPConfig 188.8.131.52p1 mostly on Debian and Ubuntu. But I had some problems on one of my servers where all of my websites are almost identical(except some .php config files). What I can see is that I have wrong files executed by websites which they don't belong to. For example website web4 is showing some errors in my error log about .php files of web3. Also some informations from database which should be printed just by web3 are also printed by web4. This depends on which site I visit as first. This is what I tried so far: spinned 2 new virtual servers with different OS(Ubuntu 14.04 and Debian 7) and different repositories checked all configuration files (but have not touched any of them) Checked if this is problem of APCu or ZendOpzimizer (problems were still there after I disabled both of them) So I am wondering if this has to do something with PHP-FPM sockets on which these sites are listening. Software I am using: nginx 1.6.0 PHP-FPM 5.5.12 with APCu and ZendOptimizer enabled I really hope you can help me somehow and I hope you understand me.