Microsoft KB Archive/247419

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Article ID: 247419

Article Last Modified on 10/26/2006


  • Microsoft Exchange Server 5.5 Service Pack 3

This article was previously published under Q247419


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
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.


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


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 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack


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.


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.

Additional query words: bridgehead slow link bork

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB247419