Summary

This article (KB981836) provides a fix for a network connection problem in which the connection drops on Windows Server 2003-based Hyper-V virtual machines (VMs). This issue occurs when the VMs are running under a heavy load. For detailed information, see the “Symptoms,” “Cause,” and “Resolution” sections of this article.

To download the fix for this issue, click the View and request hotfix downloads link that is located on the upper-left of the screen.

Symptoms

Consider the following scenario:

  • You install the Hyper-V role on a computer that is running Windows Server 2008 R2.

  • The computer hosts a virtual machine (VM) that is running Windows Server 2003.

  • The VM is running under a heavy load.

In this scenario, the network connection of the VM is lost and then resumes. The length of time in which there is no network connection may last from several seconds to several minutes.

When this connection problem occurs, one or both of the following events are logged in the System log on the VM:

Event Type: Warning
Event Source: netvsc
Event Category: None
Event ID: 5
Date: <date>
Time: <time>
User: N/A
Computer: <computer name>
Description: The miniport '<network adapter name>' hung.

Event Type: Warning
Event Source: netvsc
Event Category: None
Event ID: 4
Date: <date>
Time: <time>
User: N/A
Computer: <computer name>
Description: The miniport '<network adapter name>' reset.

Resolution

This hotfix is also available at Microsoft Update Catalog.

After you install this hotfix on the Hyper-V server, you must update the integration components in the VM that is running Windows Server 2003. To do this, open the Virtual Machine Connection tool to connect to the VM in Hyper-V Manager, and then click Insert Integration Services Setup Disk on the Action menu.

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 Web site:

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 2008 R2 on the computer. Additionally, the computer must have the Hyper-V role installed.

Registry information

To use the hotfix in this package, 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 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 Server 2008 R2 file information notes
  • 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 2008 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 2008 R2

File name

File version

File size

Date

Time

Platform

Service branch

Windows5.x-hypervintegrationservices-x64.msi

Not applicable

1,454,592

03-Apr-2010

07:43

Not applicable

Not applicable

Netvsc50.sys

6.1.7600.20683

105,472

03-Apr-2010

03:04

x64

Not applicable

Netvsc60.sys

6.1.7600.20683

172,544

03-Apr-2010

03:04

x64

Not applicable

Netvscres.dll

6.1.7600.16385

42,496

14-Jul-2009

01:30

x64

Not applicable

Passthruparser.sys

6.1.7600.16385

20,480

13-Jul-2009

23:42

x64

AMD64_WSTORVSP.INF_31BF3856AD364E35_6.1.7600.20683_NONE_8ABC4AACE145A298

Storvsp.sys

6.1.7600.20683

120,320

03-Apr-2010

03:04

x64

AMD64_WSTORVSP.INF_31BF3856AD364E35_6.1.7600.20683_NONE_8ABC4AACE145A298

Vhdparser.sys

6.1.7600.16385

17,408

13-Jul-2009

23:42

x64

AMD64_WSTORVSP.INF_31BF3856AD364E35_6.1.7600.20683_NONE_8ABC4AACE145A298

Vmbus.sys

6.1.7600.20683

200,584

03-Apr-2010

07:35

x64

Not applicable

Vmbuscoinstaller.dll

6.1.7600.16385

130,048

13-Jul-2009

23:42

x64

Not applicable

Vmbuspipe.dll

6.1.7600.16385

15,360

13-Jul-2009

23:42

x64

Not applicable

Vmbusres.dll

6.1.7600.16385

44,544

14-Jul-2009

01:30

x64

Not applicable

Winhv.sys

6.1.7600.16385

52,304

14-Jul-2009

01:48

x64

Not applicable

Vmsntfy.dll

6.1.7600.20683

72,192

03-Apr-2010

07:27

x64

Not applicable

Vmswitch.sys

6.1.7600.20683

403,968

03-Apr-2010

03:04

x64

Not applicable

Windows5.x-hypervintegrationservices-x86.msi

Not applicable

1,014,272

03-Apr-2010

08:11

Not applicable

Not applicable

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

Additional file information for Windows Server 2008 R2

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

File name

Amd64_0fdc9776732b71cc126d1e61246fdebe_31bf3856ad364e35_6.1.7600.20683_none_ab5ace2b4574fadc.manifest

File version

Not applicable

File size

1,082

Date (UTC)

06-Apr-2010

Time (UTC)

07:16

File name

Amd64_6f5b35e519a8ee06f349b3d193b8ab09_31bf3856ad364e35_6.1.7600.20683_none_635289eb0f7cb1ae.manifest

File version

Not applicable

File size

1,082

Date (UTC)

06-Apr-2010

Time (UTC)

07:16

File name

Amd64_microsoft-hyper-v-g..aller-win5x-package_31bf3856ad364e35_6.1.7600.20683_none_2ea9bb90bd24947d.manifest

File version

Not applicable

File size

2,273

Date (UTC)

03-Apr-2010

Time (UTC)

09:36

File name

Amd64_microsoft-hyper-v-g..aller-win60-package_31bf3856ad364e35_6.1.7600.20683_none_94f598c4ee356376.manifest

File version

Not applicable

File size

3,369

Date (UTC)

03-Apr-2010

Time (UTC)

10:10

File name

Amd64_wnetvsc.inf_31bf3856ad364e35_6.1.7600.20683_none_b39abd74024c3ab0.manifest

File version

Not applicable

File size

2,657

Date (UTC)

06-Apr-2010

Time (UTC)

07:16

File name

Amd64_wstorvsp.inf_31bf3856ad364e35_6.1.7600.20683_none_8abc4aace145a298.manifest

File version

Not applicable

File size

3,047

Date (UTC)

06-Apr-2010

Time (UTC)

07:16

File name

Amd64_wvmbus.inf_31bf3856ad364e35_6.1.7600.20683_none_95fd3749dcd7cc6a.manifest

File version

Not applicable

File size

3,731

Date (UTC)

06-Apr-2010

Time (UTC)

07:16

File name

Amd64_wvms_pp.inf_31bf3856ad364e35_6.1.7600.20683_none_bf6225082432cf76.manifest

File version

Not applicable

File size

2,772

Date (UTC)

03-Apr-2010

Time (UTC)

09:37

File name

Update.mum

File version

Not applicable

File size

2,371

Date (UTC)

06-Apr-2010

Time (UTC)

07:16

File name

X86_microsoft-hyper-v-g..aller-win5x-package_31bf3856ad364e35_6.1.7600.20683_none_d28b200d04c72347.manifest

File version

Not applicable

File size

2,269

Date (UTC)

03-Apr-2010

Time (UTC)

08:33

File name

X86_microsoft-hyper-v-g..aller-win60-package_31bf3856ad364e35_6.1.7600.20683_none_38d6fd4135d7f240.manifest

File version

Not applicable

File size

3,363

Date (UTC)

03-Apr-2010

Time (UTC)

08:47

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