In CentOS 6.0 you can’t upload files that are bigger than approx. 100kb in PLESK 10.3.1 on a domain that uses PHP with mod_fcgid.

Why?

mod_fcgid changed the maximum POST request length size from 1GB to only 128kb with release 2.3.6. I don’t know any reasons for this, but appearently Parallels forgot to change this setting to a reasonable value…

How to Fix it?

For CentOS 6.0 you have to edit /etc/httpd/conf.d/fcgid.conf and add a line with a new FcgidMaxRequestLen value. Just add it below the other options:

LoadModule fcgid_module modules/mod_fcgid.so

<IfModule mod_fcgid.c>

<IfModule !mod_fastcgi.c>
    AddHandler fcgid-script fcg fcgi fpl
</IfModule>

  FcgidIPCDir /var/run/mod_fcgid/sock
  FcgidProcessTableFile /var/run/mod_fcgid/fcgid_shm

  FcgidIdleTimeout 400
  FcgidProcessLifeTime 300
  FcgidMaxProcesses 100
  FcgidMaxProcessesPerClass 8
  FcgidMinProcessesPerClass 0
  FcgidConnectTimeout 300
  FcgidIOTimeout 450
  FcgidInitialEnv RAILS_ENV production
  FcgidIdleScanInterval 10

  # set POST to 1GB
  FcgidMaxRequestLen 1073741824

</IfModule>