Symptoms

You find that network interface cards (NIC) that are teamed (also known as Load Balancing/Failover or LBFO) disappear from component listings in Windows Server 2012 R2. This causes the Hyper-V Virtual Switch (vSwitch) to become private, or isolated. This problem can also cause many additional problems. For example, the clustering service may generate the following error message:

The virtual machine requires a highly available virtual switch connection and the host network adapter is not attached to a highly available virtual switch.

Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. 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, go to 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 update, you must first install update 2919355 in Windows Server 2012 R2.

Registry information

To enable this fix, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

The English (United States) 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 8.1 and Windows Server 2012 R2 file information and notesImportantWindows 8.1 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 0.16xxx

    Windows 8.1 and Windows Server 2012 R2

    RTM

    GDR

    6.3.960 0.20xxx

    Windows 8.1 and Windows Server 2012 R2

    RTM

    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 8.1 and 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 x86-based versions of Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Netcfgx.dll

6.3.9600.17114

391,000

03-May-2014

09:18

Not applicable

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

File name

File version

File size

Date

Time

Platform

Netcfgx.dll

6.3.9600.17114

486,744

03-May-2014

11:35

x64

Netcfgx.dll

6.3.9600.17114

391,000

03-May-2014

09:18

x86

Additional file information

Additional file information for Windows Server 2012 R2

Additional files for all supported x86-based versions of Windows Server 2012 R2

File name

X86_444ccd7fd63c242279f4b7642b78121d_31bf3856ad364e35_6.3.9600.17114_none_0106b702ff882e94.manifest

File version

Not Applicable

File size

710

Date (UTC)

04-May-2014

Time (UTC)

01:20

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

X86_microsoft-windows-ndis-tdi-bindingengine_31bf3856ad364e35_6.3.9600.17114_none_d30040cb40e8b788.manifest

File version

Not Applicable

File size

13,221

Date (UTC)

03-May-2014

Time (UTC)

09:57

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

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

File name

Amd64_444ccd7fd63c242279f4b7642b78121d_31bf3856ad364e35_6.3.9600.17114_none_5d255286b7e59fca.manifest

File version

Not Applicable

File size

712

Date (UTC)

04-May-2014

Time (UTC)

01:20

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Amd64_5a77f15866f8aa615e17882d68425c4c_31bf3856ad364e35_6.3.9600.17114_none_4fc39b0850450717.manifest

File version

Not Applicable

File size

714

Date (UTC)

04-May-2014

Time (UTC)

01:20

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Amd64_microsoft-windows-ndis-tdi-bindingengine_31bf3856ad364e35_6.3.9600.17114_none_2f1edc4ef94628be.manifest

File version

Not Applicable

File size

13,227

Date (UTC)

03-May-2014

Time (UTC)

12:17

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

X86_microsoft-windows-ndis-tdi-bindingengine_31bf3856ad364e35_6.3.9600.17114_none_d30040cb40e8b788.manifest

File version

Not Applicable

File size

13,221

Date (UTC)

03-May-2014

Time (UTC)

09:57

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable


Status

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

References

Learn about the terminology that Microsoft uses to describe software updates.

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