Configuring WHMCS 500 Server Error In Client Area

I am configuring WHMCS on my dedicated server.

I use cPanel as well.

This is my first time installing WHMCS.

I can access and use the admin panel of WHMCS, but when trying to access the client area I simply get a 500 error.

I have no clue how to even approach this problem.

I have googled quite a bit regarding this error and there is no content.

I assume it's probably something like a check box I forgot to check, but being a first time user I likely missed it.

What steps should I take to resolve this problem?

Note: When trying to access client area on SSL it redirects to non ssl before showing 500 error.

It seems that there is an permission OR .htaccess code issues. Please check your Apache server error logs so that you will get exact root cause of this 500 error.

The reason for the server 500 error: lack of memory in PHP.

Solution: Increased limit for a single script to 128M and issue resolved.

It's unfortunate that a simple "lack of memory" couldn't have been displayed..

You will have to troubleshoot this further. First login to your server via SSH (root user or sudo user - depending on your server configuration( and run following command:

tail -f /usr/local/apache/log/error_log

Now access your client area and see if it generates any error in error log.

Root cause of 500 error can be server's configurations or permissions issue.