A process serving application pool 'Classic .NET AppPool' suffered a fatal communication error with the Windows Process Activation Service

Question

I am running an ASP.NET 3.5 web application on IIS 7 on Windows Server 2008.

I received the following error earlier this afternoon:

HTTP Error 503. The

Answer 1

Its most likely caused by an infinite loop.

(I just had the same problem.) So you will just have to look for places in the code that use loops and see if removing one of them stops the error. Once you have found the culprit, then you can try to figure out whats causing it to loop indefinitely.