Symptoms

Navigating to TOP > Service > Applications > Application Instances, the page loads for 5 minutes and eventually shows the error:

Error 503
Sorry, the service is not available
Try to reload page later.

There is a vast amount of APS 2.0 application instances (>20000).

Cause

The page rendering will get optimized in scope of APS-41694.

Resolution

Increase Apache timeout to 10 minutes on the Branding node(s) per the instruction from the article:

Operations in CCP fail with Service Unavailable error

Internal content