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Article ID: 2741850 - Last Review: January 10, 2013 - Revision: 2.0

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Symptoms

Consider the following scenario:
  • You enable the TCP/IP Offloading feature on a computer that is running Windows 7 or Windows Server 2008 R2.
  • A network adapter that supports TCP/IP Offloading is installed on the computer.
  • The network adapter does not support the TCP Selective Acknowledgements (SACK) option.
In this scenario, the TCP SACK option for offloaded TCP connections on the network adapter is always set to true. Therefore, you experience poor performance in busy network environments.

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 website:
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, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
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 apply this hotfix, 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.

File information

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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 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" 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:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 0.21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. 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 7
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.22172240,48823-Nov-201205:49x86
Fwpkclnt.sys6.1.7600.21380187,22423-Nov-201205:10x86
Tcpip.sys6.1.7600.213801,303,91223-Nov-201205:10x86
Fwpkclnt.sys6.1.7601.22172187,73623-Nov-201205:49x86
Tcpip.sys6.1.7601.221721,307,99223-Nov-201205:49x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.22172376,66423-Nov-201205:59x64
Fwpkclnt.sys6.1.7600.21380288,10423-Nov-201205:53x64
Tcpip.sys6.1.7600.213801,878,37623-Nov-201205:53x64
Fwpkclnt.sys6.1.7601.22172288,61623-Nov-201205:59x64
Tcpip.sys6.1.7601.221721,902,42423-Nov-201205:59x64
For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.22172711,00023-Nov-201205:07IA-64
Fwpkclnt.sys6.1.7600.21380482,64823-Nov-201204:41IA-64
Tcpip.sys6.1.7600.213803,807,06423-Nov-201204:41IA-64
Fwpkclnt.sys6.1.7601.22172483,16023-Nov-201205:07IA-64
Tcpip.sys6.1.7601.221723,819,86423-Nov-201205:07IA-64
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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.

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

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Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
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File nameUpdate.mum
File versionNot Applicable
File size2,773
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameX86_26044e90acbdfede455298ffd1305ce4_31bf3856ad364e35_6.1.7600.21380_none_175459c5cfe74d05.manifest
File versionNot Applicable
File size702
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameX86_dc0985d72dd1ad04391363e46c31c8d8_31bf3856ad364e35_6.1.7601.22172_none_a8cfd956430464d8.manifest
File versionNot Applicable
File size1,054
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameX86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22172_none_58e9732a2cdfdd0a.manifest
File versionNot Applicable
File size2,540
Date (UTC)23-Nov-2012
Time (UTC)06:14
PlatformNot Applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.21380_none_b378eb20e0dc13f8.manifest
File versionNot Applicable
File size3,834
Date (UTC)23-Nov-2012
Time (UTC)05:32
PlatformNot Applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22172_none_b56c18a6ddf896a1.manifest
File versionNot Applicable
File size3,834
Date (UTC)23-Nov-2012
Time (UTC)06:18
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameAmd64_05bae63ad76921f2b189f3314c8fb93e_31bf3856ad364e35_6.1.7601.22172_none_d8c6e19b3da6f053.manifest
File versionNot Applicable
File size1,414
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameAmd64_51809ba4992bd7e1a1738fb78030c5be_31bf3856ad364e35_6.1.7600.21380_none_0bbbb2a87ea78a49.manifest
File versionNot Applicable
File size706
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameAmd64_9f9582a09accee4c4c9ed8a920bbfb5a_31bf3856ad364e35_6.1.7601.22172_none_0c661c2230e1fe66.manifest
File versionNot Applicable
File size1,060
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameAmd64_a86b74c6a499518d81a63d1e3f9d2c31_31bf3856ad364e35_6.1.7601.22172_none_a380a6c1caecad26.manifest
File versionNot Applicable
File size712
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22172_none_b5080eade53d4e40.manifest
File versionNot Applicable
File size2,542
Date (UTC)23-Nov-2012
Time (UTC)07:05
PlatformNot Applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.21380_none_0f9786a49939852e.manifest
File versionNot Applicable
File size3,838
Date (UTC)23-Nov-2012
Time (UTC)06:42
PlatformNot Applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22172_none_118ab42a965607d7.manifest
File versionNot Applicable
File size3,838
Date (UTC)23-Nov-2012
Time (UTC)07:12
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size4,059
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22172_none_bf5cb900199e103b.manifest
File versionNot Applicable
File size1,166
Date (UTC)23-Nov-2012
Time (UTC)06:00
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File nameIa64_6a8bd2a03be0c1be7ad3bca7885faa43_31bf3856ad364e35_6.1.7600.21380_none_b6c1f292d6599d54.manifest
File versionNot Applicable
File size704
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameIa64_ef59e55f05cc0090f37e6d3f55f56dda_31bf3856ad364e35_6.1.7601.22172_none_6a9526be54af28da.manifest
File versionNot Applicable
File size1,411
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22172_none_58eb17202cdde606.manifest
File versionNot Applicable
File size2,541
Date (UTC)23-Nov-2012
Time (UTC)06:55
PlatformNot Applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.21380_none_b37a8f16e0da1cf4.manifest
File versionNot Applicable
File size3,836
Date (UTC)23-Nov-2012
Time (UTC)06:34
PlatformNot Applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22172_none_b56dbc9cddf69f9d.manifest
File versionNot Applicable
File size3,836
Date (UTC)23-Nov-2012
Time (UTC)06:59
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,947
Date (UTC)23-Nov-2012
Time (UTC)13:28
PlatformNot Applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22172_none_bf5cb900199e103b.manifest
File versionNot Applicable
File size1,166
Date (UTC)23-Nov-2012
Time (UTC)06:00
PlatformNot Applicable
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Applies to
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Starter
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Web Server 2008 R2
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2741850
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