Start the MRSProxy Service on a Remote Client Access Server

Topic Last Modified: 2011-03-19

The Mailbox Replication Proxy (MRSProxy) service is installed on every Exchange 2010 Client Access server. MRSProxy helps to facilitate cross-forest move requests and runs on the remote forest's Exchange 2010 Client Access server. However, by default, MRSProxy is disabled. To start MRSProxy on the Client Access server in the remote forest, you must modify the Client Access server's Web.config file.

All Client Access servers in the Network Load Balancing (NLB) array must have MRSProxy started. When you create a remote move request and specify the fully qualified domain name (FQDN) of the RemoteHostName parameter, the load balancers that share the same name space as the FQDN you specified can direct the move request to any of the Client Access servers in that array. If you don't have MRSProxy started on one of the Client Access servers, and a move request is directed to that server, the move request will fail. For more information about the NLB array, see "Availability Service Network Load Balancing" in Understanding the Availability Service.
Before you make any changes to the Web.config file, make a copy of the file and store it in a safe location.

Looking for other management tasks related to move requests? Check out Managing Move Requests.

When MRSProxy is enabled, you can connect to the endpoint by using a Web application such as Microsoft Internet Explorer. Use the following URL:


Replace ClientAccessServerName with the name of the Client Access server on which you enabled MRSProxy. If you get a "Page not found" error, MRSProxy isn't enabled on that server.

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Text editor" entry in the Client Access Permissions topic.

  1. On the remote Client Access server, open the following file with a text editor such as Notepad:
    <Exchange Installation Path>\V14\ExchWeb\EWS\web.config
  2. Locate the following section in the Web.config file:
    <!-- Mailbox Replication Proxy Server configuration -->
    DataImportTimeout="00:01:00" />
  3. Change the value of IsEnabled to "true".
  4. Save and close the Web.config file.