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Ubuntu + ISPConfig 3 + WordPress with Internal Server Error 500

Ubuntu: 12.04.04LTS updated
ISPConfig: 3.0.5.4p1
WordPress: 3.9.1

Anyway here is how to fix it:
 nano /etc/apache2/mods-available/fcgid.conf
and add there (below FcgidConnectTimeout):
MaxRequestLen 15728640
So now there it set request limit to 15 MB
Btw. the fcgid.conf file should after this modification look like this:

AddHandler fcgid-script .fcgi
FcgidConnectTimeout 20
MaxRequestLen 15728640

Source: http://www.hackerway.ch/2012/11/17/how-to-fix-wordpress-running-at-ispconfig-3-giving-error-500-internal-server-error/

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