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Multiple SCP objects RRS feed

  • Question

  • Hello,

    If multiple SCP objects are returned to client by dc (assuming that client belongs to multiple sites), which one out of those will client pick?

    Thanks

    Monday, August 19, 2013 5:35 AM

Answers

All replies

  • Hi

    >>assuming that client belongs to multiple sites

    Do you mean AD sites?  A client can only belong to a single AD site.  If you have a CAS Array object configured for the CAS server(s) in each site (you should have) then that will be returned to the client depending on which AD site they are in and your load balancing method will determine which CAS server the client connects to.

    Steve

    Monday, August 19, 2013 7:30 AM
  • Hi,

    According to your description, I consider that there may be multiple CAS servers in your Exchange environment. The SCP object is used by domain-connected clients to locate the Autodiscover service.

    When using a domain joined client in multiple sites, the Autodiscover service in Outlook would try to connect to the first Client Access Server of the local site using the “serviceBindingInformation” attribute and thekeywords” attribute of SCP.

    The client would try all of the SCPs one by one in CASs’ setup ordering until it is connected to a CAS successful or all fails.

    Here are some helpful references below:

    1. How the Autodiscover service works with clients

        http://technet.microsoft.com/en-us/library/jj591328(v=exchg.141).aspx#BKMK_HowAutodiscoverWorks

    2. Service Connection Point (SCP) In Exchange 2010

       http://howexchangeworks.com/2011/07/service-connection-point-scp-in.html

    Hope it helps.

    Thanks



    Tuesday, August 20, 2013 10:08 AM
    Moderator
  • It doesn't necessarily have to be the local site.  You can have a site that contains Outlook users and workstations, but no Exchange servers.

    The important point is that the workstations site matches the autodiscover site coverage as configured in Exchange.   

    If there is a match for site coverage, then it gets a list of CAS URI's that match that site coverage.  If no match for site coverage then it get's an ot of site list.  Note that it is one or the other, not both.  if that all fails then it drops to DNS....

    Details and links in here: http://blogs.technet.com/b/rmilne/archive/2011/10/21/exchange-amp-the-autodiscover-web-service.aspx


    Cheers,

    Rhoderick

    Microsoft Senior Exchange PFE

    Blog: http://blogs.technet.com/rmilne  Twitter:   LinkedIn:   Facebook:   XING:

    Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

    Tuesday, August 20, 2013 8:43 PM
  • Hi Guys,

    Thanks for everyone response. What i meant was that when a client gets multiple SCP objects, which one out of those will use?

    Assume that after installing CAS servers in three different sites, i run the "Set-ClientAccessServer -identity" commands on all the three and configure Site A on all of them.

    Now when my client in site A will request for SCP object, there will be three objects returned. How client will determine which SCP object to use? the one that is first alphabetically or one that was configured first or something else.

    Friday, August 23, 2013 4:53 AM
  • Hi,

    Please go through here , you will find your answer.


    Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

    Friday, August 23, 2013 5:11 AM
  • Now when my client in site A will request for SCP object, there will be three objects returned. How client will determine which SCP object to use? the one that is first alphabetically or one that was configured first or something else.

    If the Autodiscover site affinity is not deployed, Outlook will always find the earliest SCP which was created when installing the first CAS in the organization.

    If you want the Outlook to access SCP on specific CAS, deploy site affinity.

    For more information about Site Affinity, please refer to Configuring the Autodiscover service to use site affinity for internal communication in:

    http://technet.microsoft.com/zh-cn/library/jj591328(v=exchg.141).aspx#BKMK_ConfiguringSiteAffinityInternal

    Thanks,

    Winnie Liang



    Monday, August 26, 2013 8:47 AM
    Moderator