Cannot Log into REST Admin (AGS 10)

I was dealing with an annoying issue today involving logging into the REST admin area of ArcGIS Server 10.  Basically I would log in, nothing would happen and no error message would be displayed.

For anybody having this issue, it turns out it was related to the domain of the user's account.  Basically if the user account is not local, but instead on a different domain, they will not be able to log into the ArcGIS Server 10 REST admin interface.  This is a known bug #NIM059442.

Upgrade to the latest service pack and it should fix the problem.