I\'m working with an ASP.NET MVC project that seems to be having some issues when attaching to the IIS process (w3wp.exe). I\'m running the solution and IIS 8.5 on my own lo
I know this is not the OPs issue, but I had this happen on a project. The solution had multiple MVC projects and the wrong project was set as startup.
I had also set the configuration of the project(s) to just start process/debugger and not open a new browser window.

So on the surface it looks as if the debugger is starting up, but it does so for the wrong process. So check that and keep in mind that you can attach to multiple processes also.
Silly mistake that left me scratching my head for about 30 minutes.
