XCON: TCP/IP Control Block Shortage Event ID 9156

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This article was previously published under Q247419

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SYMPTOMS

After you apply Service Pack 3 for Exchange Server version 5.5, the following error message may be logged in the Windows NT Event Viewer application event log:

Event ID: 9156
Source: MSExchangeMTA
Type: Warning
Category: Resource
Description:
A resource limit has been reached while attempting to open an association. There is no free control blocks available for network type 1.
The configured count is 40. [BASE IL MAIN BASE 1 282] (10)

After this error message is logged, the message transfer agent (MTA) may stop processing messages and you may need to restart the service before mail flows again.

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CAUSE

The MTA leaks control blocks. Under stress or slow connection conditions this issue becomes apparent.

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RESOLUTION

To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 (http://support.microsoft.com/kb/191014/EN-US/ ) XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack

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WORKAROUND

You can use the Evtscan utility from the BackOffice Resource Kit to stop and start the MTA as soon as you detect a 9156 event in the application event log.

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STATUS

Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5 Service Pack 3. This problem was first corrected in Exchange Server 5.5 Service Pack 4.

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APPLIES TO

Microsoft Exchange Server 5.5 Service Pack 3

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kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB247419

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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