Ports used by Exchange Server while communicating with MS Outlook Clients

Posted on 2009-04-20
Last Modified: 2012-06-27
We are running MS Exchange 2003 and using MS outlook clients that connect over RPC End point mapper (port 135) to Exchange Server. We wish to know which TCP port the exchange server uses in turn for further communication with the outlook clients.
Based on the monitoring tools, we just saw that it used tcp 1144 once but then it was changed to 1164.
The objective is to implement QoS on the routers based on the protocol type.
Question by:altuwairqi
    LVL 15

    Expert Comment

    RPC/HTTP uses ports 135, 443, 6001, 6002, 6004, and some random ports.

    For more information see and browse down to the section on "Microsoft Exchange Server and Outlook clients."  This also has a nice table of all the ports and services behind those ports.

    If you set your QoS for ports 35, 443, 6001, 6002, and 6004 for your exchange server you should be fine.

    Hope that helps,

    LVL 65

    Accepted Solution

    Restricting Outlook down to specific ports is not recommended because it requires changes to the configuration of the server to stop the use of the random ports.
    If you need to have Outlook on specific ports then implement RPC over HTTPS, which goes over a single port only - 443.


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