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Cross domain authentication

Last Modified: 2015-08-29
Here is my scenario:

Users and workstations at site X authenticate to an AD under, let's say, Domain-X

The servers are hosted at a remote data centre, which has a domain named Domain-Y.

Now, the users need to access the web portals under Domain-Y. In this case, should I deploy an ADFS in the data centre perimeter network to handle the authentication requests? I've read up a bit on ADFS and it seems that it is not trivial to set this up.

In actual fact, the users, workstations and servers all belong to the same organization, and I want to keep things simple. I thought of setting up a one way trust from the server domain (Domain-Y) to the site X domain (Domain-Y). But in doing so, do I still need an ADFS?

Lastly, does the AD at Domain-Y need a connection to the AD at Domain-X to retrieve the user account info?

All help is much appreciated. Thanks in advance.
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