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

Article ID: 2263829 - View products that this article applies to.
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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 Service Pack 1 (SP1).
  • 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. Additionally, the network adapter may be disabled.

Notes
  • You must restart the virtual machine to recover from this issue.
  • This issue can also occur on versions of Windows Server 2008 R2 that do not have SP1 installed. To resolve the issue, apply the hotfix that is described in one of the following Microsoft Knowledge Base articles:
    974909
    (http://support.microsoft.com/kb/974909/ )
    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

    2264080
    (http://support.microsoft.com/kb/2264080/ )
    An update rollup package for the Hyper-V role in Windows Server 2008 R2: August 24, 2010
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RESOLUTION

Update information

How to obtain this update

The following file is available for download from the Microsoft Download Center:
Collapse this imageExpand this image
Download
Download the update package now.
(http://www.microsoft.com/downloads/details.aspx?FamilyId=da4fa7cf-85df-4a53-b9da-a31be3c923e6)


For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591
(http://support.microsoft.com/kb/119591/ )
How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites

To apply this update, you must be running Windows Server 2008 R2 Service Pack 1. Additionally, you must have Hyper-V role installed on your computer.

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932
(http://support.microsoft.com/kb/976932/ )
Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the update 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 update.

Update replacement information

This update does not replace a previously released update.

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 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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.1.760 1 . 17xxxWindows Server 2008 R2SP1GDR
    6.1.760 1 . 21xxxWindows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, extremely important issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • 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 nameFile versionFile sizeDateTimePlatform
Hvax64.exe6.1.7601.17579614,40015-Mar-201102:35x64
Hvboot.sys6.1.7601.17579118,14415-Mar-201105:34x64
Hvix64.exe6.1.7601.17579652,28815-Mar-201102:35x64
Hvax64.exe6.1.7601.21683614,40015-Mar-201102:28x64
Hvboot.sys6.1.7601.21683118,14415-Mar-201105:19x64
Hvix64.exe6.1.7601.21683652,28815-Mar-201102:28x64
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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 nameAmd64_40382355b5f3a572fc0403869e69124c_31bf3856ad364e35_6.1.7601.17579_none_72342a76e87e6455.manifest
File versionNot applicable
File size710
Date (UTC)16-Mar-2011
Time (UTC)02:28
PlatformNot applicable
File nameAmd64_50af227f4655d69403c72117a3b37d76_31bf3856ad364e35_6.1.7601.21683_none_a0d84a7142d73a87.manifest
File versionNot applicable
File size710
Date (UTC)16-Mar-2011
Time (UTC)02:28
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7601.17579_none_8e3b7aba7c50f851.manifest
File versionNot applicable
File size4,163
Date (UTC)15-Mar-2011
Time (UTC)06:00
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7601.21683_none_8eb445dd957c1c02.manifest
File versionNot applicable
File size4,163
Date (UTC)15-Mar-2011
Time (UTC)05:46
PlatformNot applicable
File nameUpdate-bf.mum
File versionNot applicable
File size1,440
Date (UTC)16-Mar-2011
Time (UTC)02:28
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,462
Date (UTC)16-Mar-2011
Time (UTC)02:28
PlatformNot applicable
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Properties

Article ID: 2263829 - Last Review: July 12, 2011 - Revision: 4.0
APPLIES TO
  • Windows Server 2008 R2 Service Pack 1, when used with:
    • Windows Server 2008 R2 Datacenter
    • Windows Server 2008 R2 Enterprise
    • Windows Server 2008 R2 Standard
Keywords: 
kbhotfixserver kbsurveynew kbexpertiseinter atdownload kbfix KB2263829
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