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What ports do I need to open on a firewall between two domains for Trusts

Hello
What ports do I need to open on a firewall that exists between domains, for a Forest Trust Relationship?
I also need DNS too, I guess.
Thanks
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Mike Kline
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Hi Mike
If I have Windows Server 2008 R2 on both sides of the firewall, but both side have DCs that are running at Windows Server 2003 functional level, which set of rules in the KB do I use?
Thanks