Symptoms

Consider the following scenario:

  • You have the Hyper-V server role installed on a computer that is running Windows Server 2012 R2.

  • You create a switch team over a physical network adapter.
    Note The virtual machine queue (VMQ) is enabled on the network adapter.

  • You create a virtual switch over the switch team.
    Note There is no forward extension present.

  • Network traffic passes through the virtual switch.

In this scenario, the computer crashes, and data loss occurs.

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 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 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 be running Windows Server 2012 R2.

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.

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 Server 2012 R2 file information notesImportant Windows 8.1 hotfixes and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows 8.1" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1" 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

    6.3.960 0.16 xxx

    Windows Server 2012 R2

    RTM

    GDR

  • 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 Server 2012 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Vmsif.dll

6.3.9600.16384

62,464

22-Aug-2013

09:34

x64

Vmsnetsetupplugin.dll

6.3.9600.16384

33,792

22-Aug-2013

09:52

x64

Vmswitch.sys

6.3.9600.16475

686,080

24-Nov-2013

23:47

x64

Vmsif.dll

6.3.9600.16384

62,464

22-Aug-2013

09:34

x64

Vmsntfy.dll

6.3.9600.16384

88,576

22-Aug-2013

10:49

x64

Vmswitch.sys

6.3.9600.16475

686,080

24-Nov-2013

23:47

x64

Mslbfoprovider.sys

6.3.9600.16423

115,712

08-Oct-2013

07:38

x64

Wnv.sys

6.3.9600.16474

705,024

23-Nov-2013

07:08

x64

Wnvapi.dll

6.3.9600.16384

61,952

22-Aug-2013

09:53

x64

Vmsif.dll

6.3.9600.16384

62,464

22-Aug-2013

09:34

x64

Vmsntfy.dll

6.3.9600.16384

88,576

22-Aug-2013

10:49

x64

Vmswitch.sys

6.3.9600.16475

686,080

24-Nov-2013

23:47

x64

Vmsif.dll

6.3.9600.16384

62,464

22-Aug-2013

09:34

x64

Vmsntfy.dll

6.3.9600.16384

88,576

22-Aug-2013

10:49

x64

Vmswitch.sys

6.3.9600.16475

686,080

24-Nov-2013

23:47

x64




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 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 for Windows Server 2012 R2

Additional files for all supported x64-based versions of Windows Server 2012 R2

File property

Value

File name

Amd64_3c5bd115312b4309869c6e4c33c94db3_31bf3856ad364e35_6.3.9600.16475_none_4ed8e453de0a8793.manifest

File version

Not applicable

File size

708

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_48b3b4cc6f7d336aa60cf10ca4c48569_31bf3856ad364e35_6.3.9600.16475_none_d1f0a8fa8cfba289.manifest

File version

Not applicable

File size

695

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_8a9fe2e875e43663d2294d0a6792c2a1_31bf3856ad364e35_6.3.9600.16475_none_7cce0a3ad08c39b2.manifest

File version

Not applicable

File size

725

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_aa7fdffd35cc6cc6529fe1b2cb0daede_31bf3856ad364e35_6.3.9600.16475_none_a502d2b7d0c6947f.manifest

File version

Not applicable

File size

701

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_microsoft-hyper-v-d..ch-coresystem-state_31bf3856ad364e35_6.3.9600.16475_none_e85ff43843871c41.manifest

File version

Not applicable

File size

10,075

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_microsoft-hyper-v-drivers-vmswitch_31bf3856ad364e35_6.3.9600.16475_none_59d56baa540ae972.manifest

File version

Not applicable

File size

7,637

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_microsoft-windows-ndis-lbfo_31bf3856ad364e35_6.3.9600.16475_none_022e32cbeabed6f9.manifest

File version

Not applicable

File size

21,660

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_microsoft-windows-wnv_31bf3856ad364e35_6.3.9600.16475_none_a07048c52ab22ee2.manifest

File version

Not applicable

File size

54,090

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_wvms_pp.inf_31bf3856ad364e35_6.3.9600.16475_none_53afc584c5506266.manifest

File version

Not applicable

File size

3,379

Date (UTC)

26-Nov-2013

Time (UTC)

05:28

File name

Amd64_wvms_pp_coresys.inf_31bf3856ad364e35_6.3.9600.16475_none_622dd8c7603f7295.manifest

File version

Not applicable

File size

3,411

Date (UTC)

26-Nov-2013

Time (UTC)

05:29


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