WHMCS 500 Internal Server Error

[imperio]

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PHP Warning:  Module 'ionCube Loader' already loaded in Unknown on line 0

somewhere ionCube Loader included more than once

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[Sat Apr 05 16:14:06 2014] [warn-phpd] The ionCube PHP Loader is disabled because of startup problems. (pid 5955)

Check that you haven't installed the Loader twice

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upstream prematurely closed connection while reading response header from upstream

i think your problem whis apache
this message means that apache does not withstand the load and drops the connection


try to increase the limits of PHP and Apache

[n1kko]

Thanks for all your help I'm still unable to fix the issue. I'm not an expert at this stuff sloth ought vestacp is a great free panel think I will stick with cPanel for my main server.

[imperio]

I think the problem in the server limits
(apache and php)