Port used for client communication

What ports does a non-domain joined Outlook 2010 client use to communicate with a domain controller?
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Cliff GaliherCommented:
Depends on the version of exchange and the configure connection method. MAPI, RPC, and OA each use different ports.
Santosh GuptaCommented:
Hi, Port 389 is used for authentication either machine is in Workgroup or Domain.
At first just to clarify that Outlook 2010 running on a non-domain computer won't communicate with a DC except the DC is just the mail server.

Secondly please clarify which kind communication are you referring to in your question? Outlook to access the mail server or the computer to join the domain?
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albatros99Author Commented:
This is for the communication between Outlook 2010 (on the non-domain joined client) communicating with the exchange 2010 CAS server. Obviously because the exchange server is not in the same domain as the client and there is no trust, at some point the user will be prompted for authentication. What are the ports that will be used for the authentication traffic?
Cliff GaliherCommented:
If you configure for RPC then the ports are dynamic. If you configure OA then it is 443. IMAP, POP3, and SMTP all have different ports as well. So again, it do ends on the method you choose.
albatros99Author Commented:
I'm referring to an RPC client. It's clear that the ports used for Outlook traffic are dynamic but the original question is: Is there a need to contact a domain controller directly or will all authentication traffic be handled by the CAS server?
Cliff GaliherCommented:
Outlook will not contact a domain controller for authentication purposes.

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