clients separated from DC by firewall

straightforward question - I have a range of PCs that are separated from their domain controller by a PIX. I need to know what ports are required for me to join these clients to the domain.

the doc 'Active Directory in Networks Segmented by Firewalls' leads me to believe I need:

445 (DS)
88 (Kerberos)
389 (LDAP)
53 (DNS)

assume both TCP and UDP for the above. The problem is I am getting and RPC error and I see 135 being dropped by my PIX. What are the ports needed to join a computer to a domain?

Is there a 'right' way to do this?

Thanks
Blake

.

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