Topic Last Modified: 2010-02-22

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source


Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Hub Transport and Edge Transport/Transport

Rule Name

The topology doesn't contain a route to the server in the Active Directory site in the routing tables.


This Error event indicates that the Microsoft Exchange Server 2010 transport routing engine can't find a route to the specified Exchange server in the specified Active Directory site. Therefore, routing is unable to deliver messages to this server. This error may be caused by replication latency. This error can also occur if there are no Hub Transport servers configured in the specified Active Directory site.

User Action

To resolve this error, do one or more of the following:

  • Verify that the specified Active Directory site is included in at least one IP site link.

  • If the specified Active Directory site was recently created, this error may be caused by Active Directory replication latency. Because no route is available, the messages will be delivered to the Unreachable queue and resubmitted when routing configuration changes.

  • Verify that the Active Directory site that is specified in the error message text contains at least one Hub Transport server.

  • Review the Application log and System log on your Exchange 2010 servers for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this error.

  • Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and others. Alternatively, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Technical Support, be sure to review your organization's guidelines first.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.