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Map a drive for a user in child domain loggin ginto a computer in parent domain?

Does anyone know the best way I can set up so where a user that's located in a chlid-domain, logs onto a computer in the parent domain (say the "Marketing" OU), that their T-Drive gets mapped to a file share in the same parent domain?

I've tried applying it to an OU but user who logs in from the child domain just doesn't get the drive.
It's a user preference that runs a "replace" action of the T-Drive, preference to map drive with item level targetting if they're in a security group (security group is in the child domain).
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garryshape
Asked:
garryshape
3 Solutions
 
Felicia KingCommented:
It sounds like to me you need to detect the local domain of the workstation the user is logging onto as part of the analysis or decision process for whether one T drive or another gets applied. Have you worked in that logic to your logon script?
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CoralonCommented:
Did you enable the Allow Cross-Forest User Policy and Roaming User Profiles policy?

And where exactly did you set this GPP up at?
Did you put it in the User's OU or the Machine's OU?  

In AD, the machine has to read the policy, and the user session has to apply it.  So, you may end up needing to set the GPP in both places.  

My suggestion would be (if possible) to set the policy at the machine level in the parent domain, and turn on Loopback processing with the Merge option (this is in group policy under the machine level section).  This would give you the best chance for success to do what you want.

Coralon
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garryshapeAuthor Commented:
The following worked:

Parent Domain
Created Universal Security Group for child-domain users to be members of

Parent Domain "Marketing" computers OU:
Created/linked GPO for Computer Loopback set to "merge"
Created/linked GPO Preference to "Replace" mapped drive T, applying only when in scope, item-level-filtering to users that are members of the Universal Security Group.
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