How to enable detailed error reporting for Plesk interface on Windows Server

Question

How to enable detailed error reporting for Plesk interface?

Answer

1. Connect to your Plesk server via RDP.
2. Open the file %plesk_dir%admin\htdocs\web.config in a text editor.

3. Change the errorMode value from:

   CONFIG_TEXT: errorMode="Custom"

   to 

   CONFIG_TEXT: errorMode="DetailedLocalOnly"

4. Save the changes and close the file.

   Now Plesk interface will show a more informative error message when opening Plesk in a local web browser on the server.