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'Messages waiting to be routed' Queue is Frozen

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]  

Topic Last Modified: 2006-05-17

The Microsoft® Exchange Server Analyzer Tool queries the ExchangeLink Windows® Management Instrumentation (WMI) class to determine the value of the StateFrozen key for the Simple Mail Transfer Protocol (SMTP) Messages waiting to be routed queue.

If the Exchange Server Analyzer finds that the value of the StateFrozen key for the Messages awaiting directory lookup queue on an Exchange server is set to True, the Exchange Server Analyzer displays an error.

A frozen queue means the transport sessions for that queue are stopped. A frozen queue prevents outgoing messages, although new messages can be added. You can manually change the state of a connection by using the shortcut menu on each link queue. When you use the Force Connection command to change a queue state to Active, you immediately enable a connection that sends the messages from that queue.

The Messages waiting to be routed queue holds messages until their next-destination server is determined, and then moves them to their respective link queues.

Messages accumulate in this queue if Exchange Server routing problems exist. Message routing may be backed up.

To resolve this error, increase diagnostic logging for the MSExchangeDSAccess service and for the MSExchangeTransport service to collect information about categorizer components.

For more information about how to modify logging settings, see "How to Modify Logging Settings for MSExchangeTransport" in the "Troubleshooting Mail Flow and SMTP" section of the Exchange Server Transport and Routing Guide (http://go.microsoft.com/fwlink/?LinkId=47579).

For more information about how to troubleshoot SMTP queues, see the following Exchange resources:

 
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