Article ID: 870985
Article Last Modified on 6/1/2006
APPLIES TO
- Microsoft Message Queuing 2.0
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 many clients connect to Microsoft Message Queuing, also known as MSMQ, Message Queuing may exhaust its kernel-pool memory. This problem may become worse when Message Queuing executes Active Directory queries while processing incoming messages. Validating client certificates is an example of an incoming message.
CAUSE
This problem may occur when many Message Queuing clients connect to Message Queuing at the same time. This causes an accumulation of Transmission Control Protocol (TCP) buffers in the kernel-pool memory. This TCP buffer-pool memory accumulation is the result of many outstanding messages that are not promptly processed by Message Queuing.
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.
Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.
To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
Prerequisites
You must have Service Pack 4 or later.
Restart requirement
You must restart your computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfix.
File information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name -------------------------------------------------------------- 13-Jul-2004 17:50 5.0.0.792 291,088 Mq1repl.dll 22-Dec-2003 22:26 5.0.0.791 14,096 Mq1sync.exe 11-May-2004 15:34 5.0.0.794 76,944 Mqac.sys 13-Jul-2004 17:50 5.0.0.791 217,360 Mqads.dll 20-Sep-2003 19:23 5.0.0.761 25,360 Mqbkup.exe 13-Jul-2004 17:50 5.0.0.785 76,560 Mqdscli.dll 13-Jul-2004 17:50 5.0.0.773 42,256 Mqdssrv.dll 22-Dec-2003 22:26 5.0.0.791 98,064 Mqmig.exe 13-Jul-2004 17:50 5.0.0.791 266,512 Mqmigrat.dll 13-Jul-2004 17:50 5.0.0.793 222,480 Mqoa.dll 13-Jul-2004 17:50 5.0.0.784 10,000 Mqperf.dll 13-Jul-2004 17:50 5.0.0.797 437,520 Mqqm.dll 13-Jul-2004 17:50 5.0.0.778 102,672 Mqrt.dll 13-Jul-2004 17:50 5.0.0.776 70,928 Mqsec.dll 13-Jul-2004 17:50 5.0.0.783 400,656 Mqsnap.dll 13-Jul-2004 17:50 5.0.0.762 23,824 Mqupgrd.dll 13-Jul-2004 17:50 5.0.0.793 110,864 Mqutil.dll 13-Jul-2004 17:50 5.0.0.748 64,784 Msmq.cpl
The hotfix that is discussed in this article limits the number of clients that can connect to Message Queuing. This hotfix adds two registry entries that may cause the client to have its connection reset when that client tries to connect to Message Queuing. This behavior occurs if the threshold is reached. The client must wait until another connection is available. The new registry entries follow:
- MaxInSessions
- WaitMaxInSessions
The new registry entries are located in the following registry subkey:
HKEY_LOCAL_MACHINE\software\microsoft\msmq\parameters
Use the following table to configure the new registry entries:
| Name | Type | Value description |
|---|---|---|
| MaxInSessions | DWORD | This value represents the actual number of sessions that Message Queuing lets connect at the same time. When this value is -1, or if the MaxInSessions new registry entry is not present, there is no change. The number of connections is not limited. |
| WaitMaxInSessions | DWORD | This value represents the time interval in milliseconds that Message Queuing waits until it verifies the number of active sessions. Message Queuing does this to verify whether new sessions can be accepted. This entry only applies if the MaxInSessions new registry entry is present, and the number-of-sessions limit is reached. |
MORE INFORMATION
When Message Queuing diagnostic logging is enabled, Message Queuing logs the following message when Message Queuing stops accepting new sessions:
When Message Queuing resumes accepting new sessions, Message Queuing logs the following message:
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
REFERENCES
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
Keywords: kbbug kbfix kbqfe kbwin2000presp5fix kbhotfixserver KB870985
