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Outlook Anywhere clients cannot connect to a CAS server after you apply Exchange Server 2010 SP2 RU3
Article ID: 2725008 - View products that this article applies to.
Consider the following scenario:
RopHandler: Logon: [RopExecutionException] The client should use Outlook Anywhere and RpcClientAccess server from site Site B to access the mailbox.
This issue occurs because of a change in Exchange Server 2010 SP2 RU3. After you install Exchange Server 2010 SP2 RU3, RPC clients are redirected to the CAS server in the same site as the client mailbox.
Note CAS servers in other sites will not accept an RPC connection request if there is an endpoint that is Outlook Anywhere enabled in the same site as the mailbox. Additionally, the client profile is updated.
To resolve this issue, use one of the following methods, as appropriate for your situation.
Method 1: Disable Outlook Anywhere on CAS servers that are not exposed to the Internet
Note We recommend that you use this method to resolve the issue that is described in the "Symptoms" section.
To resolve this issue, disable Outlook Anywhere on CAS servers that are not exposed to the Internet. After you disable Outlook Anywhere on CAS servers that are not exposed to the Internet, clients can connect to a CAS server in a different site.
Method 2: Disable preferred site enforcement
To resolve this issue, disable preferred site enforcement. To do this, create the following DWORD registry value:
Value Name: EnablePreferredSiteEnforcement
Data Type: REG_DWORD
Note After you set the EnablePreferredSiteEnforcement value to 0, a CAS server will accept connection requests from any site and not try to redirect the request to a different server.
In earlier versions of Exchange Server 2010, client connection requests were not redirected to other CAS servers. Therefore, the endpoints were not used in a site that was not exposed to the Internet. The CAS server to which the client connected would connect directly to the mailbox server. Additionally, the user profiles were not updated. Because the user profiles were not updated, availability issues might occur if a mailbox was moved to a different site.
After you install Exchange Server 2010 SP2 RU3, Exchange Server tries to redirect connection requests and update the user profile intelligently. This can result in better performance and increased availability.
For more information about cross-site availability issue in earlier versions of Exchange Server 2010, visit the following TechNet website: