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Server 2003 & Trusts between domains

Posted on 2006-04-24
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Last Modified: 2010-04-18
I have three domain controllers behind one router.  The three servers all run Server 2003 Enterprise and are on the following IP set:

192.168.x.1
192.168.x.2
192.168.x.3

I want to establish trusts between the three domains so all users can authenticate to each domain as needed.  After going thru the wizard, I receive a failuire errors telling the user already exists.

I'm looking for step-by-step instructions and help on setting up these trusts.  I am using my domain names (ie: domain1, domain2, domain3) when I try to set up these trusts, and I am attempting two-way trusts in the wizard.

Can someone walk me thru this, step-by-step, inclusing what I type in each box, so I can get it down?

Thank you

Cliff
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Question by:crp0499
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Expert Comment

by:Netman66
ID: 16531094
If these domains are all in the same forest, they trust each other already.

You should already be able to log onto the other domains using the UPN (user@domain.com).

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Author Comment

by:crp0499
ID: 16531131
Well, they are all on the same IP set if that's what you mean.  When I ran dcpromo on them, I made each one a new domain controller and created a new forrest.
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Author Comment

by:crp0499
ID: 16531138
PS: I can log into each one, but it's becasue I created the same user names and passwords in all three domains.  In the future, I'd like the other two to be updated when I add a new user in the first domain.
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Author Comment

by:crp0499
ID: 16531507
I figured out that I had not raised my servers to the Server 2003 domain/forest levels.  I've done that and identified that I want to establish a forest trust.

However, when I get to the end of the wizard, I am asked to provide a username and password who has access to domain 2.  I put it a user that exists in domain 2 and who has access to establish the trust, and I still get the error that the trust failed and the user already exists.
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Accepted Solution

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Netman66 earned 2000 total points
ID: 16533138
First off, the users will not populate all 3 server when create in one domain.  You'll need to remove duplicate users on the other servers.  Just leave the users on the domain they belong to and use user@domain to log in when NOT in their home domain.

When you supply credentials to the wizard for the opposite domain, use DOMAIN\Administrator in the username box.

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Author Comment

by:crp0499
ID: 16534207
Thank you Netman66!

Got it working like I wanted...

:)
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