How to enable/disable debug logging in Plesk?
The debug mode can be enabled either via the Plesk Panel.ini Editor extension in Plesk or in the Plesk configuration file "panel.ini" directly on a Plesk server.
In Plesk for Linux, debug log entries are written to the Plesk logfile
/var/log/plesk/panel.log. Also, when running Plesk utilities with debug mode enabled in a command-line interface, they will produce debug log entries in their output.
In Plesk for Windows Server, debug log entries are written to the Plesk logfile
Warning: Once you are done with troubleshooting, disable debug mode back. Otherwise, it may fill up disk space over time.