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The network connection of a running Hyper-V virtual machine is lost under heavy outgoing network traffic on a Windows Server 2008 R2-based computer

Article ID: 974909 - View products that this article applies to.

Hotfix Download Available

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SYMPTOMS

Consider the following scenario:

You install the Hyper-V role on a computer that is running Windows Server 2008 R2.
You run a virtual machine on the computer.
You use a network adapter on the virtual machine to access a network.
You establish many concurrent network connections, or there is heavy outgoing network traffic.

In this scenario, the network connection on the virtual machine may be lost sporadically. Additionally, the network adapter is disabled.

Note You have to restart the virtual machine to recover from this issue.

This issue can also occur on a computer that is running Windows Server 2008 R2 Service Pack 1. To resolve the issue, apply the hotfix that is described in one of the following Microsoft Knowledge Base articles:

2263829

(http://support.microsoft.com/kb/2263829/ )

The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1

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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 Web site:

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

(http://support.microsoft.com/contactus/?ws=support)

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.

Prerequisites

To apply this hotfix, your computer must be running Windows Server 2008 R2. Additionally, you must have Hyper-V role installed on your computer.

Restart requirement

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

Registry information

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

File information

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 Server 2008 R2 file information notes

The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
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Version Product SR_Level Service branch
6.1.760 0 . 20xxx Windows Server 2008 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 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

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File name	File version	File size	Date	Time	Platform
Hvax64.exe	6.1.7600.20531	643,072	19-Sep-2009	02:50	x64
Hvix64.exe	6.1.7600.20531	707,072	19-Sep-2009	02:50	x64

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STATUS

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

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MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684

(http://support.microsoft.com/kb/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

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File name	Amd64_276e2a0fcbe4acc209449343632de35b_31bf3856ad364e35_6.1.7600.20531_none_912c505d8b67a3da.manifest
File version	Not Applicable
File size	710
Date (UTC)	22-Sep-2009
Time (UTC)	20:14
Platform	Not Applicable

File name	Amd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7600.20531_none_8d01f22d982efa3e.manifest
File version	Not Applicable
File size	3,985
Date (UTC)	22-Sep-2009
Time (UTC)	20:14
Platform	Not Applicable

File name	Update.mum
File version	Not Applicable
File size	1,456
Date (UTC)	22-Sep-2009
Time (UTC)	20:14
Platform	Not Applicable