Finding out which CAS is being used in a CAS array

Posted on 2011-10-14
Last Modified: 2012-05-12

We have a test Exchange 2010 SP1 system being used...there is a CAS array with three CAS servers; CAS1, CAS2, CAS3.

Can anyone tell me,

1. If an Outlook client connects via a CAS server to the mailbox server succesfully, how can I tell which CAS server in specific the traffic passed through

2. If Outlook CANNOT connect via the CAS array to the mailbox server, how can I tell which CAS server it's trying to connect to?
Question by:neil4933
    LVL 12

    Expert Comment

    by:Deepu Chowdary
    You can use netstat to check which clients are connected to host.
    LVL 16

    Expert Comment

    you can use the following power shell CMDLET to set the CAS server for clients:-

    get-mailboxdatabase |select name, rpcclientaccessserver

    for more details have a look on
    LVL 32

    Expert Comment

    how are you load balancing the connections (windows nlb or hardware load balancer)?

    1 - to determine which CAS server a mailbox connected to you can use the RPC Client Access logs
    2 - you could get a network trace to determine why the client is connecting and also use the hosts file to test against each cas individually

    Author Comment


    WHen using netstat what do I need to type exactly?
    LVL 32

    Accepted Solution

    it all depends on how you are load balancing your clients
    you most likely need to use the RPC Client Access logs under the install directory and logging folder

    netstat -ano

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