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Q257995: XCON: Dynamic RAS Connector Server Does Not Work with 9315, 9405

Article: Q257995
Product(s): Microsoft Exchange
Version(s): winnt:4.0,5.0,5.5
Operating System(s): 
Keyword(s): exc4 exc5 exc55
Last Modified: 11-JUN-2002

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The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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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:

  Q256986 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.

1. Start Registry Editor (Regedt32.exe).

2. Locate the RAS LAN-MTA DMOD Threads value under the following key in the
  registry:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeMTA\Parameters

3. If necessary, increase this value from 2 to 4; on the Edit menu, click
  String, type "4" (without the quotation marks), and then click OK.

4. Locate the "Concurrent connections to RAS LAN-MTAs" value under the following
  key in the registry:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeMTA\Parameters

5. If necessary, increase this value from 2 to 10 (decimal); on the Edit menu,
  click String, type "10" (without the quotation marks) (decimal), and then
  click OK.

6. Quit Registry Editor.

7. Restart the MTA service after you make these changes so that they take
  effect.

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          : exc4 exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbprb

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