Article: Q247419
Product(s): Microsoft Exchange
Version(s): winnt:5.5 SP3
Operating System(s):
Keyword(s): exc55sp3 kbExchange550preSP4fix kbExchange550sp4Fix
Last Modified: 06-AUG-2002
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The information in this article applies to:
- Microsoft Exchange Server, version 5.5 SP3
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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.
CAUSE
=====
The MTA leaks control blocks. Under stress or slow connection conditions this
issue becomes apparent.
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:
Q191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack
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.
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.
Additional query words: bridgehead slow link bork
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Keywords : exc55sp3 kbExchange550preSP4fix kbExchange550sp4Fix
Technology : kbExchangeSearch kbZNotKeyword2 kbExchange550SP3
Version : winnt:5.5 SP3
Issue type : kbbug
Solution Type : kbfix
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