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Article ID: 884046 - Last Review: November 15, 2007 - Revision: 3.6

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Microsoft Message Queuing service (Mqsvc.exe) exhausts its private bytes.


This problem occurs when your Message Queuing client application makes repeated calls to the MessageQueue.GetPrivateQueuesByMachine function. These calls are made to retrieve a list of all private queues on a specified computer. Message Queuing does not have the deletion code that is required to remove the lists of private queues.


Service pack information

To resolve this problem, obtain the latest service pack for Microsoft Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
889100  ( ) How to obtain the latest service pack for Windows Server 2003

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: (
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


Windows Server 2003

Restart requirement

You must restart your computer after you apply this 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
   18-Aug-2004  14:20  5.2.1728.199       77,312  Mqac.sys
   18-Aug-2004  15:22  5.2.1728.199      192,000  Mqads.dll 
   18-Aug-2004  14:21  5.2.1728.199       28,160  Mqbkup.exe 
   18-Aug-2004  15:22  5.2.1728.199        9,728  Mqcertui.dll
   18-Aug-2004  15:22  5.2.1728.199       31,232  Mqdbodbc.dll
   18-Aug-2004  15:22  5.2.1728.199       47,616  Mqdscli.dll 
   18-Aug-2004  15:22  5.2.1728.199       48,128  Mqdssrv.dll 
   18-Aug-2004  15:22  5.2.1728.199       44,544  Mqgentr.dll 
   18-Aug-2004  15:22  5.2.1728.199       28,160  Mqise.dll 
   18-Aug-2004  15:22  2001.12.4720.193   71,680  Mqlogmgr.dll
   18-Aug-2004  14:21  5.2.1728.199       39,424  Mqmig.exe 
   18-Aug-2004  15:22  5.2.1728.199      220,160  Mqmigrat.dll
   18-Aug-2004  15:22  5.2.1728.199      230,400  Mqoa.dll 
   18-Aug-2004  15:22  5.2.1728.199       15,872  Mqperf.dll 
   18-Aug-2004  15:22  5.2.1728.199      777,216  Mqqm.dll 
   18-Aug-2004  15:22  5.2.1728.199      169,472  Mqrt.dll 
   18-Aug-2004  15:22  5.2.1728.199      117,248  Mqrtdep.dll 
   18-Aug-2004  15:22  5.2.1728.199      133,632  Mqsec.dll 
   18-Aug-2004  15:22  5.2.1728.199      508,928  Mqsnap.dll 
   18-Aug-2004  15:22  5.2.1728.199       50,176  Mqupgrd.dll 
   18-Aug-2004  15:22  5.2.1728.199      421,888  Mqutil.dll 


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Server 2003 Service Pack 1.


To detect this problem, you can use Performance Monitor. Performance Monitor can monitor the value of the Private Bytes counter. The Private Bytes counter is in the Process object for the instance of mqsvc, also known as Message Queuing service.

For additional information about terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684  ( ) Description of the standard terminology that is used to describe Microsoft software updates

  • Microsoft Message Queuing 3.0
kbautohotfix kbwinserv2003sp1fix kbwinserv2003presp1fix kbbug kbfix kbprb kbhotfixserver kbqfe KB884046
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