Load balancing outlook clients

Posted on 2012-08-16
Last Modified: 2012-08-28
Hi Experts,

We presently have two sites. An office where all users reside in, and a data centre
An AD box is present in both sites and they are connected via a Site to Site VPN

I am trying to achieve full High availability and load balancing with the exchange servers, that reside in the data centre. So far i have set up forefront protection, which is publishing and load balancing the CAS servers.

Now as far as i understand it, this allows the active sync, outlook anywhere and owa to be load balanced, since they all use https (i have tested using owa, and this seems to be working fine, so i presume the others will too)

My question is however, what about the outlook clients in the office?
How do they connect to exchange?
Is there any way to also load balance their connections, so that in the event a server is taken down, the users wont notice?
Question by:FSIFM
    LVL 33

    Expert Comment

    you configure that by using the RPCCLIENTACCESSSERVER attribute you point that to the NLB IP, you can use Microsoft Windows NLB or a hardware load balancer to do that, once you have the VIP you will have your outlook client connect to it and enjoy the LB
    LVL 4

    Author Comment

    Hi Busbar,

    Where do you configure the RPCCLIENTACCESSSERVER attribute?
    Also what ports does it use?
    LVL 33

    Assisted Solution

    LVL 28

    Accepted Solution

    You need to configure a CAS Array with a pool of CAS Servers.

    CAS Servers hold the Client Access Role which provide email access for Outlook(MAPI), EAS (Phones, Devices), EWS (Using API)
    LVL 4

    Author Comment

    Cheers for the links guys, they've been very useful. However having a bit of trouble with the NLB manager on the Forefront server

    For some reason when i point it at the either exchange server it cannot connect, saying that the rpc service is unavailable

    Now if i do it in forefront itself, it connects fine?

    Also i checked the servers and RPC is running fine? Any ideas?

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