Plesk website is not accessible in a browser with the 500 error: Cannot read configuration file due to insufficient permissions

Symptoms

• A Plesk domain is not accessible with the HTTP error 500 in a browser.

• When accessing the domain in a browser directly from the server, the following error is provided:

  CONFIG_TEXT: HTTP Error 500.19 - Internal Server Error
  The requested page cannot be accessed because the related configuration data for the page is invalid.
  
  Detailed Error Information:
  Module IIS Web Core
  Notification Unknown
  Handler Not yet determined
  Error Code 0x80070005
  Config Error Cannot read configuration file due to insufficient permissions
  Config File \?\C:\inetpub\vhosts\example.com\web.config
  Requested URL http://example.com:80/

Cause

Incorrect permissions to the domain's Document root.

Resolution

1. Connect to the server via RDP.

2. Start the Command Prompt as Administrator.

3. Execute the commands below to fix permissions based on the number of affected domains: