Web Application Problems (web.config errors) HTTP 500.19 with IIS7.5 and ASP.NET v2

Question

This is driving the whole team crazy. There must be some simple mis-configured part of IIS or our Web Server, but every time we try to run out ASP.NET Web Application on IIS

Answer 1

To sum up based on answers here and elsewhere:

1. Check the .NET version of the app pool (e.g. 2.0 vs 4.0)
2. Check that all IIS referenced modules are installed. In this case it was the AJAX extensions (probably not the case these days), but URL Rewrite is a common one.