Addressbook through firewall

[rasindia]

Hi,
Is there a problem to get the active directory address book through the firewall? If not, can anybody tell me what I port need to open for this?

I am able to get PO3 or IMAP by opening ports. But, not the addresses.

Server: Exchange 2000 Service pack 2

 

[ACraib]

I think you will need to open port 3268 to a GC server.