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

I just tracked down and fixed the same nasty problem. A couple things that could cause the problem:

• A Server.Transfer() loop
• Calling CurrentThread.Abort() in certain scenarios.. (Like after a Server.Transfer()!)

Fixing those things is what fixed it for us.