When a website is opened, it asks for authentication or is redirected to this IIS error message:
HTTP Error 401.2 - Unauthorized
You are not authorized to view this page due to invalid authentication headers.
IIS > Sites > example.com > Authentication > Anonymous Authentication > Specific user is selected.
The password for the built-in IIS user is out of sync with the Windows user.
Use the following utilities to fix the issue:
"%plesk_cli%\\repair.exe" --update-websites-anonymous-user (Plesk only)