Symptoms

Consider the following scenario:

  • You enable Message Queuing (also known as MSMQ) 5.0 on a computer that is running Windows 7 or Windows Server 2008 R2.

  • You run an application that uses Message Queuing to transfer messages to a remote server. Additionally, you enable message encryption for Message Queuing to transfer messages.

  • Two or more queues are hosted on the same remote server.

In this scenario, the contents of the messages may become corrupted, and there is no notification.

Cause

The issue occurs because a race condition may occur when two threads use the same key to encrypt messages.

Resolution

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 the problem described in this article. 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 website:

http://support.microsoft.com/contactus/?ws=supportNote 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.

Prerequisites

To apply this hotfix, you must have the Message Queuing feature installed on a computer that is running one of the following operating systems:

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes


Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.20xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Mqqm.dll

6.1.7600.20881

934,400

15-Jan-2011

05:33

x86

Mqqm.dll

6.1.7601.21642

934,400

15-Jan-2011

05:34

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Mqqm.dll

6.1.7600.20881

1,517,568

15-Jan-2011

06:19

x64

Mqqm.dll

6.1.7601.21642

1,517,568

15-Jan-2011

06:20

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Mqqm.dll

6.1.7600.20881

3,014,144

15-Jan-2011

05:12

IA-64

Mqqm.dll

6.1.7601.21642

3,014,144

15-Jan-2011

05:11

IA-64

Status

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 Message Queuing, visit the following Microsoft TechNet website:

General information about Message QueuingFor more information about encryption for Message Queuing, visit the following Microsoft MSDN website:

General information about encryption for Message QueuingFor more information about software update terminology, 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

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not applicable

File size

2,268

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

X86_466f2ba34db77b6364e6e89a696dcde1_31bf3856ad364e35_6.1.7600.20881_none_2608547683c86959.manifest

File version

Not applicable

File size

710

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

X86_f65ca8c71305434c6617a547248ded92_31bf3856ad364e35_6.1.7601.21642_none_d0797a52c031b544.manifest

File version

Not applicable

File size

710

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

X86_microsoft-windows-msmq-queuemanager-core_31bf3856ad364e35_6.1.7600.20881_none_8013dd02da0e69a6.manifest

File version

Not applicable

File size

2,742

Date (UTC)

15-Jan-2011

Time (UTC)

06:09

Platform

Not applicable

File name

X86_microsoft-windows-msmq-queuemanager-core_31bf3856ad364e35_6.1.7601.21642_none_82267a02d7137f25.manifest

File version

Not applicable

File size

2,742

Date (UTC)

15-Jan-2011

Time (UTC)

06:07

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_0da74c86809a2217b1e40bdcf166eb85_31bf3856ad364e35_6.1.7600.20881_none_d11498e5e848a97f.manifest

File version

Not applicable

File size

714

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

Amd64_4ed96fbafaaf0ae94bdf6cc43937a1bf_31bf3856ad364e35_6.1.7601.21642_none_5e85921e39f03f71.manifest

File version

Not applicable

File size

714

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

Amd64_microsoft-windows-msmq-queuemanager-core_31bf3856ad364e35_6.1.7600.20881_none_dc327886926bdadc.manifest

File version

Not applicable

File size

2,746

Date (UTC)

15-Jan-2011

Time (UTC)

07:02

Platform

Not applicable

File name

Amd64_microsoft-windows-msmq-queuemanager-core_31bf3856ad364e35_6.1.7601.21642_none_de4515868f70f05b.manifest

File version

Not applicable

File size

2,746

Date (UTC)

15-Jan-2011

Time (UTC)

07:04

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,686

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_0f4e74577e6a79bdcd4a7ff64f713e1e_31bf3856ad364e35_6.1.7600.20881_none_9ff2dc36853ae1f8.manifest

File version

Not applicable

File size

712

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

Ia64_bb905f436a3a6a9814eb4d70137b25e4_31bf3856ad364e35_6.1.7601.21642_none_bee45d02b9886bb9.manifest

File version

Not applicable

File size

712

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

File name

Ia64_microsoft-windows-msmq-queuemanager-core_31bf3856ad364e35_6.1.7600.20881_none_801580f8da0c72a2.manifest

File version

Not applicable

File size

2,744

Date (UTC)

15-Jan-2011

Time (UTC)

06:52

Platform

Not applicable

File name

Ia64_microsoft-windows-msmq-queuemanager-core_31bf3856ad364e35_6.1.7601.21642_none_82281df8d7118821.manifest

File version

Not applicable

File size

2,744

Date (UTC)

15-Jan-2011

Time (UTC)

07:00

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,937

Date (UTC)

15-Jan-2011

Time (UTC)

15:19

Platform

Not applicable

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