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Firewall configuration for Domain controller communication?

I've created a box to serve as my production domain controller at my data centre. The primary DCs sit at the office.

There is a VPN between the two locations and they sit on different subnets.

What modifications do I need to make to my new box's config to let it see the primary DC, and what firewall ports need opening to support full AD replication?
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Ryan Smith
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If you have a vpn setup between the two sites it's safe to open all ports on the vpn policy.  You should probably use vpn encryption though.
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tigermatt
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