Quick answer is you can't add users from one forest to the global/universal groups in another forest. Global groups in particular are very picky and only allow security principals from the same domain to be added to their membership.
 
I am not sure I understand the security benefits you are shooting for here anyway. You usually use a DMZ forest to separate yourself from the production internal forest because you want to protect it. If you set up a trust from A to B, it means that Forest info from A can be sucked down the pipe to B. That is what a trust is about, so user info in A is available in B (has to be or else you couldn't say put a SID of user A in a user B group and get anywhere with it).
 
When you set up a DMZ forest, it should generally be standing alone and the access from it and to it from the intranet should be strictly limited (like no RPC, no LDAP or maybe LDAPS out to DMZ to push provisioning data if really really really needed, just a couple of small holes maybe for RDP one way from intranet to DMZ).
 
--
O'Reilly Active Directory Third Edition - http://www.joeware.net/win/ad3e.htm 
 
 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Guest, Mike
Sent: Thursday, June 15, 2006 1:24 PM
To: [email protected]
Subject: [ActiveDir] Cross forest issue

Hi,

 

New member here, with an issue L

 

We have implemented 2 forests with a cross forest trust such that forest B trusts forest A one-way.

 

The intention is that all admins in forest A will be able to manage both forests, and that accounts in forest B cannot be authenticated in forest A

 

Whilst I can add the admins from forest A into a domain local group in forest B, allowing me to grant “administrators” rights, I cannot add any security principal from forest A to a universal (or global) group in forest B. This precludes me from granting domain, enterprise or schema admin rights to the forest A administrators – and thus defeats the objective of having the admins in a single forest.

 

(FYI, creating a DL, adding a remote user, then trying to change that group to a universal group gives the message “Foreign security principals cannot be members of universal groups”)

 

Forest B is in a DMZ, and is solely being used to give the benefits of centralised management to the servers in the DMZ. Consequently, we want to avoid having many user accounts in that forest. Company policy states that every admin must log on using their own account

 

Hope you can help.

 

 

 

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Mike Guest | Capgemini | Sale
Server Support | Outsourcing UK
Office: + 44 (0)870 366 1814 | 700 1814 | [EMAIL PROTECTED]
77-79 Cross Street, Sale, Cheshire. M33 7HG

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