Strange problem

This one has me really confused. Haven't seen it before, nor have I been able to find a resolution.

A client has setup a VM (vmware) with Windows 2003 Server. We installed our app on it, which uses CFMX7. We've done this for other clients before and dozens of times in our office for testing. Never had a problem. Our app comes right up.

In this case, when we access the server, we get "page can not be found" errors. Specifically, the user goes to the login page (which comes up), they enter the username/password, and click the submit button. The result is "page can not be displayed".

If we run IE right on the actual server, all works. But from other machines, we get page can not be displayed upon submission. Additionally, if we replace the form's action method with a GET (from a POST) it works from all machines!

I checked IIS mappings for CF. They allow all VERBs. Strange.

To me, it appears to be a problem with file permissions - perhaps a discrepancy between Windows and IIS. But all seems to be fine to me, especially compared with our other working servers.

Any ideas?