CA Access Gateway to Support Integrated Windows Authentication

Document ID : KB000096755
Last Modified Date : 13/06/2018
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Issue:
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 ?
Resolution:
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
Delegation.

A sample of this is explained here :

Setting up delegation between servers for Windows authenticated sites
https://pathowe.co.uk/delegation-between-servers-windows-authenticated-sites/