Iis - Trying To Get An Application Up On IIS On A Windows Server 2008 Machine?

I'm trying to get an asp.net application up on IIS on a Windows Server 2008 machine. I can hit the app from localhost, no problem. But I can't access the app using the server's domain name either locally or from another machine on the network.But here's the odd part. I can access a normal file on IIS using the domain name, both from a browser running on the server and from a browser running on another machine on the network. Here's a synopsis ("http" converted to "htp" below because I don't have enough points to have all these links in my message):

From IE on the server itself:
works htp://localhost/foo.htm
works htp://localhost/App
works htp://test.foo.com/foo.htm
dead htp://test.foo.com/App
From IE on another machine:
works htp://test.foo.com/foo.htm
dead htp://test.foo.com/App