Hello everyone, I was about to install the Dotclear blog CMS on my server (Debian Jessie + ISPConfig 126.96.36.199p8) and encountered a 500 error. I had to dig a bit into the logs to find out that apparently FastCGI is misbehaving: Apache error.log Code: [fastcgi:error] [pid 7569] (104)Connection reset by peer: [client xx.xxx.xxx.xxx:53160] FastCGI: comm with server "/var/www/clients/client1/web10/cgi-bin/php5-fcgi-*-443-blog.xyz.net" aborted: read failed [fastcgi:error] [pid 7569] [client xx.xxx.xxx.xxx:53160] FastCGI: incomplete headers (0 bytes) received from server "/var/www/clients/client1/web10/cgi-bin/php5-fcgi-*-443-blog.xyz.net" /var/log/php5-fpm.log Code: WARNING: [pool web10] child 7426 exited on signal 11 (SIGSEGV) after 121.102303 seconds from start NOTICE: [pool web10] child 7459 started /var/log/syslog Code: kernel: [1785022.597498] traps: php5-fpm general protection ip:6fb12d sp:7ffd6f872af0 error:0 in php5-fpm[400000+7f4000] I'm not exactly sure what is going on here, but it looks like something is wrong with FastCGI even though I'm not seeing this issue with other CMS/Sites installed on the server at this point. To be sure Dotclear was not at fault, I installed ISPConfig (perfect server documentation) on a local machine at home and it works fine there. And even though I Googled this error, I was not able to find a proper fix so far. Do you think FastCGI is to blame here? What should I do to troubleshoot this issue and possibly correct the problem on my server online? Any feedback welcome, thanks!