Network connection is slow when you run a WFP-based application on a computer that is running Windows 7 or Windows Server 2008 R2

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Article ID: 2735855 - View products that this article applies to.
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Symptoms

Assume that you run an application that is developed by using Windows Filtering Platform (WFP) API on a computer that is running Windows 7 or Windows Server 2008 R2. When the application filters network traffic, the network connection is slow.

Cause

This issue occurs because the computer does not send TCP/IP ACK messages until a time-out occurs. This occurs when the driver for WFP filters data that the driver receives through the network. Therefore, the network traffic stalls the transfer of data when the TCP/IP ACK messages are delayed.

Resolution

Update information

How to obtain this update

Microsoft Update
This update is available from the Microsoft Update website:
http://update.microsoft.com

Prerequisites

To apply this hotfix, you must be running Windows 7 Service Pack 1 (SP1) or 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 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:
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    VersionProductMilestoneService branch
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical 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 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 sizeDateTime
Netio.sys6.1.7601.17911240,49620-Jul-201218:33
Netio.sys6.1.7601.22067240,49620-Jul-201218:36
Fwpkclnt.sys6.1.7601.17514187,77620-Nov-201012:29
Tcpip.sys6.1.7601.179111,292,14420-Jul-201218:33
Fwpkclnt.sys6.1.7601.22067187,76020-Jul-201218:36
Tcpip.sys6.1.7601.220671,306,97620-Jul-201218:36
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameFile versionFile sizeDateTime
Netio.sys6.1.7601.17911376,68820-Jul-201219:31
Netio.sys6.1.7601.22067376,68820-Jul-201219:27
Fwpkclnt.sys6.1.7601.17514288,64020-Nov-201013:33
Tcpip.sys6.1.7601.179111,913,20020-Jul-201219:31
Fwpkclnt.sys6.1.7601.22067288,62420-Jul-201219:27
Tcpip.sys6.1.7601.220671,901,93620-Jul-201219:27
For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTime
Netio.sys6.1.7601.17911711,02420-Jul-201218:10
Netio.sys6.1.7601.22067711,02420-Jul-201218:27
Fwpkclnt.sys6.1.7601.17514483,20020-Nov-201010:33
Tcpip.sys6.1.7601.179113,791,72820-Jul-201218:11
Fwpkclnt.sys6.1.7601.22067483,16820-Jul-201218:27
Tcpip.sys6.1.7601.220673,814,76820-Jul-201218:27
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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 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

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

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Additional files for all supported x86-based versions of Windows 7
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File nameX86_65169096eeb6050afb7446275fd698a6_31bf3856ad364e35_6.1.7601.17911_none_1fb8552afca1518e.manifest
File versionNot applicable
File size708
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameX86_b79bfd3ac96baaf4558197625d591379_31bf3856ad364e35_6.1.7601.17911_none_36f5f44e90491b89.manifest
File versionNot applicable
File size702
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameX86_c590950256f92c152bbc4017d6b83b35_31bf3856ad364e35_6.1.7601.22067_none_ca854a45e8aa51b1.manifest
File versionNot applicable
File size708
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameX86_d4fa977bee9cf992f3a16dfa27be51ec_31bf3856ad364e35_6.1.7601.22067_none_ff47354e0fdd537f.manifest
File versionNot applicable
File size702
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameX86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17911_none_589fdd7b13924901.manifest
File versionNot applicable
File size2,540
Date (UTC)20-Jul-2012
Time (UTC)18:55
File nameX86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22067_none_58f942a22cd342a5.manifest
File versionNot applicable
File size2,540
Date (UTC)20-Jul-2012
Time (UTC)19:05
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.17911_none_b52282f7c4ab0298.manifest
File versionNot applicable
File size3,780
Date (UTC)24-Jul-2012
Time (UTC)03:47
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22067_none_b57be81eddebfc3c.manifest
File versionNot applicable
File size3,834
Date (UTC)20-Jul-2012
Time (UTC)19:09
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameAmd64_16ab0bd0e16424112c32d82ed8ca6ab0_31bf3856ad364e35_6.1.7601.22067_none_bbcac2e1b98e5555.manifest
File versionNot applicable
File size706
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_2703e26f55ad1122b04184b1a8b30b44_31bf3856ad364e35_6.1.7601.17911_none_3543ae29ba2b3107.manifest
File versionNot applicable
File size706
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_286d1a9b41c07764b37fe8e4221fd07e_31bf3856ad364e35_6.1.7601.17911_none_81a4ef77d5d82efb.manifest
File versionNot applicable
File size712
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_2f9130859798c27bd63589b7a0f47e2c_31bf3856ad364e35_6.1.7601.17911_none_acdba4ff8995c41a.manifest
File versionNot applicable
File size712
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_76c64ab1c0785e9f385c95ec5f7105bd_31bf3856ad364e35_6.1.7601.22067_none_ceafadcf91c2d1f3.manifest
File versionNot applicable
File size712
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_7b5333b06488d998b67e10c36c831465_31bf3856ad364e35_6.1.7601.17911_none_19e001175970d165.manifest
File versionNot applicable
File size1,066
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_a4ab5f3af0eb2438c6de74fb1119e4fd_31bf3856ad364e35_6.1.7601.22067_none_164ca20bea2b5404.manifest
File versionNot applicable
File size1,066
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_a86d921624e281bbe508b6523540da1b_31bf3856ad364e35_6.1.7601.22067_none_721a9c48a2c6b853.manifest
File versionNot applicable
File size712
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17911_none_b4be78fecbefba37.manifest
File versionNot applicable
File size2,542
Date (UTC)20-Jul-2012
Time (UTC)19:54
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22067_none_b517de25e530b3db.manifest
File versionNot applicable
File size2,542
Date (UTC)20-Jul-2012
Time (UTC)19:52
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.17911_none_11411e7b7d0873ce.manifest
File versionNot applicable
File size3,784
Date (UTC)24-Jul-2012
Time (UTC)03:56
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22067_none_119a83a296496d72.manifest
File versionNot applicable
File size3,838
Date (UTC)20-Jul-2012
Time (UTC)19:57
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17911_none_bf13235100507c32.manifest
File versionNot applicable
File size1,166
Date (UTC)20-Jul-2012
Time (UTC)18:42
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22067_none_bf6c8878199175d6.manifest
File versionNot applicable
File size1,166
Date (UTC)20-Jul-2012
Time (UTC)18:51
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File nameIa64_0ab28e7effce5e8e0a6caea2acdc8db4_31bf3856ad364e35_6.1.7601.22067_none_05e171448b017606.manifest
File versionNot applicable
File size1,064
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameIa64_50480b69d2c6b0165159a3fca18908c5_31bf3856ad364e35_6.1.7601.17911_none_f282113e2cb75969.manifest
File versionNot applicable
File size1,064
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameIa64_e201713040c9b2d9cca65c7af2ac47fe_31bf3856ad364e35_6.1.7601.22067_none_8f4fdc959e8a2fb8.manifest
File versionNot applicable
File size704
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameIa64_f15f5367f66760b2d3ef397306f851bf_31bf3856ad364e35_6.1.7601.17911_none_6c461bf169c0e5df.manifest
File versionNot applicable
File size704
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17911_none_58a18171139051fd.manifest
File versionNot applicable
File size2,541
Date (UTC)20-Jul-2012
Time (UTC)19:39
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22067_none_58fae6982cd14ba1.manifest
File versionNot applicable
File size2,541
Date (UTC)20-Jul-2012
Time (UTC)19:40
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.17911_none_b52426edc4a90b94.manifest
File versionNot applicable
File size3,782
Date (UTC)24-Jul-2012
Time (UTC)03:41
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22067_none_b57d8c14ddea0538.manifest
File versionNot applicable
File size3,836
Date (UTC)20-Jul-2012
Time (UTC)19:45
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17911_none_bf13235100507c32.manifest
File versionNot applicable
File size1,166
Date (UTC)20-Jul-2012
Time (UTC)18:42
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22067_none_bf6c8878199175d6.manifest
File versionNot applicable
File size1,166
Date (UTC)20-Jul-2012
Time (UTC)18:51
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Properties

Article ID: 2735855 - Last Review: October 24, 2012 - Revision: 2.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced kbcip KB2735855

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