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Outlook 2007 can't connect to 2010 exchange

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  • Outlook 2007 can't connect to 2010 exchange

    Have 4 exchange 2010 servers, 2 cas/ht and 2 mbx in a dag, the ht/cas are in an array with Windows NLB. Setting up outlook profile, when I enter cas array name for server and the user it resolves, or if i enter one of the cas servers it resolves back to the cas array name. When I try to connect the profile, it says Microsoft Exchange Server is Unavailable. RpcClientAccessServer for the DB is pointed to the array as it should. Any ideas?

  • #2
    Re: Outlook 2007 can't connect to 2010 exchange

    What happens if you use Autodiscover?
    Is this happening for all users or just new users?
    If you reconfigure the CAS array to point directly to one of the servers with the CAS role, does it work then?

    WNLB is horrible - the Exchange team don't even recommend its use!

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

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    • #3
      Re: Outlook 2007 can't connect to 2010 exchange

      yeah, when i broke the NLB and changed the RpcClientAccessServer to a single CAS server it worked fine. So I'm thinking there is an issue with the fact that its on a VM and its not passing the traffic. So maybe the NLB should be multicast , but I read there are certain considerations needed for ARP with that?

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      • #4
        Re: Outlook 2007 can't connect to 2010 exchange

        When it comes to WNLB, there are considerations around the number of NICs being used and Virtualisation platform, which determines the settings. What are you running on or is it physical?

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        • #5
          Re: Outlook 2007 can't connect to 2010 exchange

          WNLB on VMs is horrible. Add in problems with some network switches and the WNLB on virtual platforms and you have a huge mess.

          As it isn't Exchange related and you are going against best practise by using WNLB, there isn't much more I can do to assist other than advise dumping WNLB. I haven't deployed it and refuse to do so for any clients who ask for it, as I don't consider it a worthy solution.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

          Comment

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