WebApi's {“message”:“an error has occurred”} on IIS7, not in IIS Express

Question

I\'m working with ASP.NET MVC 4 WebApi and am having a lot of fun with it running it on my local computer on IIS Express. I\'ve configured IIS Express to serve remote machi

Answer 1

The problem was a missing dependency that wasn't on the server but was on my local machine. In our case, it was a Devart.Data.Linq dll.

To get to that answer, I turned on IIS tracing for 500 errors. That gave a little bit of information, but the really helpful thing was in the web.config setting the This pointed to a missing dynamically-loaded dependency. After adding this dependency and telling it to be copied locally, the server started working.