|Message:||The topology doesn’t contain a route to Active Directory site %1 in routing tables with the timestamp %2. Recipients will not be routed to servers in this Active Directory site. Hub Transport server %3 is unreachable.|
This Error event indicates that the Microsoft Exchange Server 2007 transport routing engine can’t calculate a route to the target Active Directory directory service site. Because no route is available, the messages will be delivered to the Unreachable queue. This event may occur when one of the following conditions is true:
For more information, see Understanding Active Directory Site-Based Routing.
To resolve this error, do one or more of the following:
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.