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Internal Server Error is registered in browser, in apache error log file I can only see the following warn thrown in same time:

[warn] mod_fcgid: process XXXXX graceful kill fail, sending SIGKILL

Are these two errors related each other?

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Sounds like you have a long-running script or something as apache is killing the worker process. Check your scripts. What does your config look lie? – Nathan C May 23 '14 at 12:13

This seems to be a related problem, with some suggestions on how to solve it: mod_fcgi in virtualmin: graceful kill fail, sending SIGKILL?

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up vote 0 down vote accepted

I found an answer on my question, the following error is also presented in the apache error log file:

mod_fcgid: read data timeout in 45 seconds Premature end of script headers: index.php

This comes from the fast cgi configuration, I increased the IOTimeout value in /etc/httpd/conf.d/fcgid.conf

FcgidIOTimeout 45 to FcgidIOTimeout 300

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