All ASP.NET Web API controllers return 404

Question

I\'m trying to get an API Controller to work inside an ASP.NET MVC 4 web app. However, every request results in a 404 and I\'m stumped. :/

I have th

Answer 1

I have dozens of installations of my app with different clients which all worked fine and then this one just always returned 404 on all api calls. It turns out that when I created the application pool in IIS for this client it defaulted to .net framework 2.0 instead of 4.0 and I missed it. This caused the 404 error. Seems to me this should have been a 500 error. Very misleading Microsoft!