Host Headers and Integrated Windows Authentication

[Akusei]

I have an interesting problem... I have an intranet web application that uses integrated windows authenticates and impersonation. everything works great if I access the site like this:

http://pcname/frolder/default.aspx

When I access the site like this.

http://pcname.domain.com/folder/default.aspx

it gives a popup asking for my username and password.

Here is some background:
I have a host header setup on this website to be the same as pcname.domain.com and an entry in DNS for pcname.domain.com. pcname.domain.com is not the same as the computer's NetBIOS name. I have tried (multiple times) to use SetSPN -A HTTP/pcname.domain.com with no luck.

My question is, does anyone know of any issues with Host headers, IWA and ASP.NET's impersonation? Or am I just not understanding how this works.

Thanks

 

[Akusei]

Bump - Need some help guys