HTTPContext issues (ASP.NET MVC2)

Hey guys, this is a weird one!

I have a site that I have deployed in 3 places. 1. My local machine. 2. Dev Server 3.QA Server开发者_开发百科. My project runs on my machine and the dev server. On the QA server, it runs, but the HTTPContext object is blank (not pulling from AD, etc).

All 3 machines live on the domain. The Dev Server and QA Server are configured identically (or so Im told). The Dev and QA Servers IIS entries are 99% identical (path names, etc are different).

Has anyone ever had this issue? It seems that the HTTPContext is just not being populated on the QA box, but the other 2 are just fine. Could there be a setting Im missing? Has anyone ever run into this before?

Thanks.