Website is showing ERR_TOO_MANY_REDIRECTS, 404 or Default Plesk Page after updating Plesk to 18.0.72 version

Symptoms

• Plesk got recently updated to 18.0.72.

• Website is showing error 

  CONFIG_TEXT: ERR_TOO_MANY_REDIRECTS 

  displaying Default Plesk Page or displaying 404 error.

• The affected website is configured as Default Site in Tools & Settings > IP Addresses.

Cause

The issue is caused by a Plesk bug with ID #PPPM-15085 already fixed in Plesk release 18.0.72.1 released on August 26th. 

Resolution

If the fix does not work, there is a workaround to the issue: set the Default Site value to none in Plesk > Tools & Settings > IP Addresses: