XCON: MTA Service on RAS Bridgehead Server Stops Repeatedly with Events 9315, 9405 (253310)


The information in this article applies to:

  • Microsoft Exchange Server 5.5
This article was previously published under Q253310
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

When you designate an Exchange Server 5.5 computer as a Remote Access Service (RAS) bridgehead server for three remote sites, the message transfer agent (MTA) may stop unexpectedly. When you restart the MTA, the service may resume its normal function only to stop repeatedly.

The application log of Event Viewer displays the following events:
Event ID: 9315
Source: MSExchangeMTA
Type: Warning
Description: A resource limit has been reached when attempting to open a RAS association. The number of entries configured is 2. [BASE IL MAIN BASE 1 505] (12)

Event ID: 9405
Source: MSExchangeMTA
Type: Error
Description: An unexpected error has occurred which may cause the MTA to terminate. Error: Double acquire of semaphore 2210. [BASE MAIN BASE 1] (16)

RESOLUTION

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.


To resolve this behavior, stop the MTA service, and then follow these steps:

  1. Start Registry Editor (Regedt32.exe).
  2. Locate the following registry key: 
      HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ 
  MSExchangeMTA\Parameters
    NOTE: The above registry key is one path; it has been wrapped for readability.
  3. Double-click the RAS LAN-MTA DMOD threads value, and increase the data value from 2 to 4.
  4. Double-click the Concurrent Connections to RAS LAN-MTAs value, and increase the data value to 10.
  5. Quit Registry Editor.
  6. Restart the MTA.
Modification Type:MinorLast Reviewed:4/28/2005
Keywords:kbprb KB253310
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