I’m running Vista Ultimate and, for some odd reason, the ASP.NET Development Server stopped serving pages after I installed IIS7 (at least that’s the last time I remembered it working).  Another oddity is that it would serve pages when I changed the localhost domain to 127.0.0.1.

I poked around a little and found a fix for the problem.  You simply need to add an entry to the “hosts” file at the following path:

C:\Windows\System32\drivers\etc

The magic line you need is:

127.0.0.1        localhost