Microsoft KB Archive/257995

= XCON: Dynamic RAS Connector Server Does Not Work with 9315, 9405 Messages in Application Event Log =

Article ID: 257995

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q257995



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
The message transfer agent (MTA) service may stop responding on an Exchange Server computer that one or more Dynamic Remote Access Service (RAS) Connectors is installed on. The following events may be logged in the application event log:

9315 MTA

A resource limit has been reached when attempting to open a RAS

association. The number of entries configured is 2.

9405 MTA

An unexpected error has occurred which may cause the MTA to terminate.

Error: Double acquire of semaphore 2210.



CAUSE
This problem can occur because, for a number of possible reasons, you need to increase certain MTA RAS registry parameters. You may need to increase these registry parameters if a high number of Dynamic RAS Connectors are installed on the Exchange Server computer, or if you run Performance Optimizer with certain settings or through manual intervention.



RESOLUTION
The default value for the RAS LAN-MTA DMOD Threads value is 2. The default value for the Concurrent connections to RAS LAN-MTAs value is 0xa (10 decimal). To resolve this problem, note these registry values and, if necessary, increase them to the values provided in the following steps:

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

 Start Registry Editor (Regedt32.exe). Locate the RAS LAN-MTA DMOD Threads value under the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeMTA\Parameters

 If necessary, increase this value from 2 to 4; on the Edit menu, click String, type 4, and then click OK. Locate the Concurrent connections to RAS LAN-MTAs value under the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeMTA\Parameters

 If necessary, increase this value from 2 to 10 (decimal); on the Edit menu, click String, type 10 (decimal), and then click OK. Quit Registry Editor.</li> Restart the MTA service after you make these changes so that they take effect.</li></ol>

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WORKAROUND
To work around this problem, restart the MTA service. Even if you do not make the registry changes in the "Resolution" section of this article, if you restart the MTA service you alleviate this problem temporarily. If you want a more permanent solution, make the registry changes in the "Resolution" section of this article.

Additional query words: error Q253310

Keywords: kbprb KB257995

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