Access violation occurs in the MSMQ service

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Article ID: 830639 - View products that this article applies to.
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When you run the Microsoft Message Queuing (MSMQ) service, you may receive an "Access Violation" error message, and a message that is similar to the following may be logged in the event log:

Source: Service Control Manager
Event Category: None
Event ID: 7031
Date: Date
Time: Time
User: N/A
Computer: ServerName
Description: The Message Queuing service terminated unexpectedly. It has done this 1 time(s).


This problem may occur when one of the following conditions is true:
  • You use a network address translation (NAT) firewall. Message Queuing cannot be used with a NAT firewall.
  • Your computer changes its IP address when you start your computer.
  • You have multiple clients that use same Message Queuing GUID because the operating system was cloned or ghosted without using the System Preparation tool (Sysprep.exe).
Message Queuing transactional messages (exactly one time and in-order delivery) are based on sequence IDs (SEQIDs). In this case, the SEQID was never sent from the computer that is associated with the SEQID. Instead of rejecting the acknowledgement as not valid, the sending system tries to process the acknowledgment as valid. This corrupts internal Message Queuing lists and eventually causes the access violation. The hotfix that is described in the "Resolution" section of this article rejects the acknowledgement. Therefore, it prevents the access violation. This hotfix only prevents the access violation.


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.

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, submit a request to 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.


No prerequisites are required.

Restart Requirement

You must restart your computer after you apply this hotfix.

Hotfix Replacement Information

This hotfix does not replace any other hotfixes.

File Information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.
   Date         Time   Version     Size    File name
   16-Oct-2003  17:28  281,360  Mq1repl.dll
   20-Sep-2003  17:23   14,096  Mq1sync.exe
   02-Oct-2003  19:21   76,016  Mqac.sys
   16-Oct-2003  17:28  217,360  Mqads.dll  
   20-Sep-2003  17:23   25,360  Mqbkup.exe 
   16-Oct-2003  17:28   76,560  Mqdscli.dll
   16-Oct-2003  17:28   42,256  Mqdssrv.dll
   20-Sep-2003  17:23   98,064  Mqmig.exe  
   16-Oct-2003  17:28  265,488  Mqmigrat.dll
   16-Oct-2003  17:28  222,480  Mqoa.dll 
   16-Oct-2003  17:28   10,000  Mqperf.dll  
   16-Oct-2003  17:28  433,936  Mqqm.dll    
   16-Oct-2003  17:28  102,672  Mqrt.dll    
   16-Oct-2003  17:28   70,928  Mqsec.dll   
   16-Oct-2003  17:28  400,656  Mqsnap.dll  
   16-Oct-2003  17:28   23,824  Mqupgrd.dll 
   16-Oct-2003  17:28  110,864  Mqutil.dll  
   16-Oct-2003  17:28   64,784  Msmq.cpl
   09-Oct-2003  00:18      6,656  Spmsg.dll   
   09-Oct-2003  00:19    140,800  Spuninst.exe
   09-Oct-2003  00:19     22,016  Spcustom.dll 


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

For more 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
For more information, 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


Article ID: 830639 - Last Review: October 26, 2013 - Revision: 4.0
Applies to
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Advanced Server
kbnosurvey kbarchive kbautohotfix kbhotfixserver kbqfe kbwin2000presp5fix kbfix kbbug KB830639

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