I deployed a large ASP.net application on IIS 7 ported from IIS 6.
There are certain parts of the application, unfortunately, that have Atlas not converted to Ajax but work on .Net framework 2.0 running on IIS 6.0. The application works just fine.
On IIS 7, the parts that still have Atlas implementation throw an JavaScript error as "Unknown Error". The rest of the application where Ajax is implemented works.
I changed the AppPool from DefaultAppPool to Classic .NET AppPool and the error goes away.
Does anyone have insights into the working of Atlas on IIS 7 and why it fails. I am not able to fit any of the IIS 7 breaking changes list to this problem.