If any ordering or orders created or activated from admin i get this error, the server account should provision on is a websitepanel server.
Do anyone has any idea? whmcs is up to date with version 4.5.2
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@mydomain.net and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache mod_fcgid/2.3.6 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at mydomain.net Port 443
This is from error log
[Wed Jun 22 18:21:27 2011] [error] [client xx.xx.xx.xx] File does not exist: /home/mydomain/public_html/500.shtml, referer: https://mydomain.net/admin/orders.php?action=view&id=11