How do I troubleshoot errors that appear inside the cPanel or WHM interfaces?

Question

How do I troubleshoot errors that appear inside the cPanel or WHM interfaces?

Answer

The best way to check on what may be causing these errors would be to run the following SSH command while loading the page that is experiencing the issue:

tail -f /usr/local/cpanel/logs/error_log

This log will contain all the errors for both the WHM and the cPanel interfaces, so if there is a problem there you can expect more details to be present in that log file.