Cannot open dedicated IIS Application Pool page Error: Unable to manage the IIS application pool because all websites are using a single dedicated pool

Symptoms

• Cannot access and manage IIS application pool settings at Domains > example.com > Dedicated IIS Application Pool for Website.

  PLESK_ERROR: Error: Unable to manage the IIS application pool because all websites are using a single dedicated application pool

• The server-wide policy is set to Always assign one application pool to each subscription at Tools & Settings > IIS Application pool > Global Settings.

Cause

This is a bug with ID PPP-45368 which is planned to be fixed in future product updates.

Resolution

As a workaround use the following server-wide IIS Application pool settings in Plesk:

1. Log in to Plesk.

2. Go to Tools & Settings > IIS Application Pool > Global Settings:.

3. Set Place websites in a dedicated application pool by default and allow shared pools and Apply the changes.