The company I work for was recently attempting to debug a IIS .NET application which took many hours to do so. In the process I discovered this awesome tool that is able to debug and trace issues with IIS in extremely high detail which helped our engineering team find the issue much faster. In fact the engineering team estimates that I saved about 5 hours of debugging time.
The best part is that it’s an official MS tool, you can find DebugDiag v2 Update 3 here