We're running CA Access Gateway (SPS), you'd like to know if users can have Windows
Authentication on a Windows Domain different of the one on which the
CA Access Gateway (SPS) machine is trusted ?
At first glance, this is a Microsoft issue, and as such it might be
possible to do that by making the Windows Domain as Trusted for
A sample of this is explained here :
Setting up delegation between servers for Windows authenticated sites
KB : KB000096755