Source servers belonging to different Active Directory sites were detected for connector ‘%1’ in routing tables with timestamp %2. Only the closest site will be used and load-balancing will be affected.

Details
Product: Exchange
Event ID: 5026
Source: MSExchangeTransport
Version: 8.0
Symbolic Name: RoutingSourceBhServersInDifferentAdSites
Message: Source servers belonging to different Active Directory sites were detected for connector ‘%1’ in routing tables with timestamp %2. Only the closest site will be used and load-balancing will be affected.
   
Explanation

This Warning event indicates that a Microsoft Exchange Server 2007 Send connector or foreign connector has been configured to use source servers that are located in different Active Directory directory service sites. When routing to this connector, the source Hub Transport server routes to the closest source server only. Configuring more than one source server for a connector provides load balancing. However, when the source servers are located in different Active Directory sites, load balancing across the source servers does not occur. For more information, see Load Balancing and Fault Tolerance for Transport Servers.

   
User Action

To resolve this error, do the following:

  • Modify the connector to specify source servers from only a single Active Directory site. You can also configure a connector with the same address space in each Active Directory site, specifying source servers from only the home Active Directory site. Load balancing will not occur across the connectors. If you do this, routing will always select the connector with the lowest cost, proximity, and finally the lowest alphanumeric name.

  • If the recommended steps do not resolve this error, contact Microsoft Customer Support Services. For more information about how to contact support, visit the Microsoft Help and Support Web site.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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