Article ID: 2888049 - View products that this article applies to.
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Introduction

This article describes an update that improves the network performance of Windows Internet Explorer 11 in Windows RT 8.1, Windows 8.1, Windows Server 2012 R2, Windows 7 Service Pack 1 (SP1), or Windows Server 2008 R2 SP1. 

Resolution

To resolve this issue, install update 2919355 in Windows 8.1 and Windows Server 2012 R2, or install update 2888049 in Windows 7 SP1 and Windows Server 2008 R2 SP1.

More information

After you install this update, Windows sends ACK messages without a delay when it uses Transmission Control Protocol (TCP) protocol connections.

Note The TCP protocol is a common protocol that a computer uses in network connections.

Update information for Windows 8.1 and Windows Server 2012 R2

For more information about how to obtain update 2919355, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014


Update information for Windows 7 SP1 and Windows Server 2008 R2 SP1

How to obtain this update

Windows Update
This update is available from Windows Update.
Microsoft Download Center
The following files are available for download from the Microsoft Download Center:
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Operating systemUpdate
All supported x86-based versions of Windows 7
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Download
Download the package now.
All supported x64-based versions of Windows 7
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Download
Download the package now.
All supported x64-based versions of Windows Server 2008 R2
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Download
Download the package now.
All supported IA-64-based versions of Windows Server 2008 R2
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Download
Download the package now.
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 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 hotfix, you must be running Windows 7 SP1 or Windows Server 2008 R2 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
  • 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 " 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.sys6.1.7601.17939240,49622-Aug-1217:16x86
Netio.sys6.1.7601.22457240,57614-Sep-131:51x86
Fwpkclnt.sys6.1.7601.18042187,7523-Jan-135:04x86
Tcpip.sys6.1.7601.182541,294,2728-Sep-132:07x86
Fwpkclnt.sys6.1.7601.22444187,8407-Sep-132:06x86
Tcpip.sys6.1.7601.224441,309,1207-Sep-132:06x86
Mswsock.dll6.1.7601.18254231,4248-Sep-132:03x86
Mswsock.dll6.1.7601.22444231,4247-Sep-132:04x86
Afd.sys6.1.7601.18264338,94414-Sep-130:48x86
Afd.sys6.1.7601.22457338,94414-Sep-130:57x86
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For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.17939376,68822-Aug-1218:12x64
Netio.sys6.1.7601.22457376,76814-Sep-132:20x64
Fwpkclnt.sys6.1.7601.18042288,0883-Jan-136:00x64
Tcpip.sys6.1.7601.182541,903,5528-Sep-132:30x64
Fwpkclnt.sys6.1.7601.22444288,1927-Sep-132:27x64
Tcpip.sys6.1.7601.224441,896,8967-Sep-132:27x64
Mswsock.dll6.1.7601.18254327,1688-Sep-132:27x64
Mswsock.dll6.1.7601.22444327,1687-Sep-132:24x64
Afd.sys6.1.7601.18264497,15214-Sep-131:10x64
Afd.sys6.1.7601.22457496,12814-Sep-131:11x64
Mswsock.dll6.1.7601.18254231,4248-Sep-132:03x86
Mswsock.dll6.1.7601.22444231,4247-Sep-132:04x86
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For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.17939711,02422-Aug-1216:51IA-64
Netio.sys6.1.7601.22457711,10414-Sep-131:34IA-64
Fwpkclnt.sys6.1.7601.18042482,1523-Jan-134:45IA-64
Tcpip.sys6.1.7601.182543,790,2728-Sep-131:35IA-64
Fwpkclnt.sys6.1.7601.22444482,2407-Sep-131:36IA-64
Tcpip.sys6.1.7601.224443,805,1207-Sep-131:36IA-64
Mswsock.dll6.1.7601.18254750,5928-Sep-131:32IA-64
Mswsock.dll6.1.7601.22444750,5927-Sep-131:34IA-64
Afd.sys6.1.7601.182641,114,62414-Sep-130:38IA-64
Afd.sys6.1.7601.224571,115,13614-Sep-130:42IA-64
Mswsock.dll6.1.7601.18254231,4248-Sep-132:03x86
Mswsock.dll6.1.7601.22444231,4247-Sep-132:04x86
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Additional file information

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Additional files for all supported x86-based versions of Windows 7
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File propertyValue
File nameX86_3e1499155fee8f88b8a89cc107db85fa_31bf3856ad364e35_6.1.7601.22457_none_dcf44532d1f2290e.manifest
File versionNot applicable
File size1,054
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameX86_5081496ef8dff9757f3cf3066d2f3c84_31bf3856ad364e35_6.1.7601.22457_none_926dc42a1724e7bf.manifest
File versionNot applicable
File size700
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameX86_6f20d92a7648d71eb43ee35ded059bb1_31bf3856ad364e35_6.1.7601.18254_none_bf590276e85337b5.manifest
File versionNot applicable
File size719
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameX86_9b5467cb1b809c18c8b4191dd7110175_31bf3856ad364e35_6.1.7601.17939_none_ff6654c1c119301f.manifest
File versionNot applicable
File size1,054
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameX86_d9811b133c9ba49437c6cb960fdca246_31bf3856ad364e35_6.1.7601.18264_none_83e6fdc52094d15c.manifest
File versionNot applicable
File size700
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameX86_f7de21c56ad807de5aadd0976ab8063f_31bf3856ad364e35_6.1.7601.22444_none_2bbc7705f42bf389.manifest
File versionNot applicable
File size719
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameX86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_58923ff3139b4b9b.manifest
File versionNot applicable
File size2,540
Date (UTC)22-Aug-2012
Time (UTC)17:35
PlatformNot applicable
File nameX86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22457_none_59041a262ccb1b50.manifest
File versionNot applicable
File size2,540
Date (UTC)14-Sep-2013
Time (UTC)02:16
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18254_none_b4fa2013c4c8ebf1.manifest
File versionNot applicable
File size3,780
Date (UTC)08-Sep-2013
Time (UTC)08:05
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22444_none_b58e8eb0ddde6cf1.manifest
File versionNot applicable
File size3,834
Date (UTC)07-Sep-2013
Time (UTC)02:32
PlatformNot applicable
File nameX86_microsoft-windows-w..-infrastructure-bsp_31bf3856ad364e35_6.1.7601.18254_none_ba2f64c78bae6989.manifest
File versionNot applicable
File size3,128
Date (UTC)08-Sep-2013
Time (UTC)02:33
PlatformNot applicable
File nameX86_microsoft-windows-w..-infrastructure-bsp_31bf3856ad364e35_6.1.7601.22444_none_bac3d364a4c3ea89.manifest
File versionNot applicable
File size3,128
Date (UTC)07-Sep-2013
Time (UTC)02:34
PlatformNot applicable
File nameX86_microsoft-windows-winsock-core_31bf3856ad364e35_6.1.7601.18264_none_d9b98067bcd7e63c.manifest
File versionNot applicable
File size73,506
Date (UTC)14-Sep-2013
Time (UTC)02:09
PlatformNot applicable
File nameX86_microsoft-windows-winsock-core_31bf3856ad364e35_6.1.7601.22457_none_da50efe2d5eab341.manifest
File versionNot applicable
File size73,506
Date (UTC)14-Sep-2013
Time (UTC)02:18
PlatformNot applicable
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Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File propertyValue
File nameNetio.sys
File version6.1.7601.17939
File size376,688
Date (UTC)22-Aug-2012
Time (UTC)18:12
Platformx64
SP requirementNone
Service levelNot applicable
File nameNetio.sys
File version6.1.7601.22457
File size376,768
Date (UTC)14-Sep-2013
Time (UTC)02:20
Platformx64
SP requirementNone
Service levelNot applicable
File nameFwpkclnt.sys
File version6.1.7601.18042
File size288,088
Date (UTC)03-Jan-2013
Time (UTC)06:00
Platformx64
SP requirementNone
Service levelNot applicable
File nameTcpip.sys
File version6.1.7601.18254
File size1,903,552
Date (UTC)08-Sep-2013
Time (UTC)02:30
Platformx64
SP requirementNone
Service levelNot applicable
File nameFwpkclnt.sys
File version6.1.7601.22444
File size288,192
Date (UTC)07-Sep-2013
Time (UTC)02:27
Platformx64
SP requirementNone
Service levelNot applicable
File nameTcpip.sys
File version6.1.7601.22444
File size1,896,896
Date (UTC)07-Sep-2013
Time (UTC)02:27
Platformx64
SP requirementNone
Service levelNot applicable
File nameMswsock.dll
File version6.1.7601.18254
File size327,168
Date (UTC)08-Sep-2013
Time (UTC)02:27
Platformx64
SP requirementSP_
Service levelAMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP
File nameMswsock.dll
File version6.1.7601.22444
File size327,168
Date (UTC)07-Sep-2013
Time (UTC)02:24
Platformx64
SP requirementSP_
Service levelAMD64_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP
File nameAfd.sys
File version6.1.7601.18264
File size497,152
Date (UTC)14-Sep-2013
Time (UTC)01:10
Platformx64
SP requirementNone
Service levelNot applicable
File nameAfd.sys
File version6.1.7601.22457
File size496,128
Date (UTC)14-Sep-2013
Time (UTC)01:11
Platformx64
SP requirementNone
Service levelNot applicable
File nameMswsock.dll
File version6.1.7601.18254
File size231,424
Date (UTC)08-Sep-2013
Time (UTC)02:03
Platformx86
SP requirementSP_
Service levelX86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP
File nameMswsock.dll
File version6.1.7601.22444
File size231,424
Date (UTC)07-Sep-2013
Time (UTC)02:04
Platformx86
SP requirementSP_
Service levelX86_MICROSOFT-WINDOWS-W..-INFRASTRUCTURE-BSP
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File propertyValue
File nameIa64_41aabbb73da922dc02483c6896f745e1_31bf3856ad364e35_6.1.7601.17939_none_6dcec72a3fbba2cc.manifest
File versionNot applicable
File size1,411
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameIa64_452fab5072fd4d76ad69ca2873fad564_31bf3856ad364e35_6.1.7601.22457_none_c22dbcbe275c7f63.manifest
File versionNot applicable
File size702
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameIa64_9d3a8c74bd4342c6bdc14bdc252a3478_31bf3856ad364e35_6.1.7601.18264_none_1bfee5c177a3c767.manifest
File versionNot applicable
File size702
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameIa64_b4effb78765b626418784b1f970ca9ad_31bf3856ad364e35_6.1.7601.22457_none_12de66d95d9e3de5.manifest
File versionNot applicable
File size1,411
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameIa64_b9a9b665088073fe5afa694517f82130_31bf3856ad364e35_6.1.7601.18254_none_cc8714587074b7ea.manifest
File versionNot applicable
File size1,084
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameIa64_c6fe22759b8cadecf1d41604c4f94428_31bf3856ad364e35_6.1.7601.22444_none_0de51ed7bc0b6cf3.manifest
File versionNot applicable
File size1,084
Date (UTC)14-Sep-2013
Time (UTC)06:03
PlatformNot applicable
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_5893e3e913995497.manifest
File versionNot applicable
File size2,541
Date (UTC)22-Aug-2012
Time (UTC)18:25
PlatformNot applicable
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22457_none_5905be1c2cc9244c.manifest
File versionNot applicable
File size2,541
Date (UTC)14-Sep-2013
Time (UTC)02:07
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18254_none_b4fbc409c4c6f4ed.manifest
File versionNot applicable
File size3,782
Date (UTC)08-Sep-2013
Time (UTC)08:03
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22444_none_b59032a6dddc75ed.manifest
File versionNot applicable
File size3,836
Date (UTC)07-Sep-2013
Time (UTC)02:20
PlatformNot applicable
File nameIa64_microsoft-windows-w..-infrastructure-bsp_31bf3856ad364e35_6.1.7601.18254_none_ba3108bd8bac7285.manifest
File versionNot applicable
File size3,130
Date (UTC)08-Sep-2013
Time (UTC)02:16
PlatformNot applicable
File nameIa64_microsoft-windows-w..-infrastructure-bsp_31bf3856ad364e35_6.1.7601.22444_none_bac5775aa4c1f385.manifest
File versionNot applicable
File size3,130
Date (UTC)07-Sep-2013
Time (UTC)02:18
PlatformNot applicable
File nameIa64_microsoft-windows-winsock-core_31bf3856ad364e35_6.1.7601.18264_none_d9bb245dbcd5ef38.manifest
File versionNot applicable
File size73,508
Date (UTC)14-Sep-2013
Time (UTC)01:56
PlatformNot applicable
File nameIa64_microsoft-windows-winsock-core_31bf3856ad364e35_6.1.7601.22457_none_da5293d8d5e8bc3d.manifest
File versionNot applicable
File size73,508
Date (UTC)14-Sep-2013
Time (UTC)02:09
PlatformNot applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_bf0585c900597ecc.manifest
File versionNot applicable
File size1,166
Date (UTC)22-Aug-2012
Time (UTC)17:23
PlatformNot applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22457_none_bf775ffc19894e81.manifest
File versionNot applicable
File size1,166
Date (UTC)14-Sep-2013
Time (UTC)02:03
PlatformNot applicable
File nameX86_microsoft-windows-w..-infrastructure-bsp_31bf3856ad364e35_6.1.7601.18254_none_ba2f64c78bae6989.manifest
File versionNot applicable
File size3,128
Date (UTC)08-Sep-2013
Time (UTC)02:33
PlatformNot applicable
File nameX86_microsoft-windows-w..-infrastructure-bsp_31bf3856ad364e35_6.1.7601.22444_none_bac3d364a4c3ea89.manifest
File versionNot applicable
File size3,128
Date (UTC)07-Sep-2013
Time (UTC)02:34
PlatformNot applicable
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References

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

Properties

Article ID: 2888049 - Last Review: April 8, 2014 - Revision: 3.0
Applies to
  • Windows 8.1 Enterprise
  • Windows 8.1
  • Windows 8.1 Pro
  • Windows RT 8.1
  • Windows Server 2012 R2 Essentials
  • Windows Server 2012 R2 Datacenter
  • Windows Server 2012 R2 Foundation
  • Windows Server 2012 R2 Standard
  • Windows 7 Service Pack 1, when used with:
    • Windows 7 Enterprise
    • Windows 7 Home Basic
    • Windows 7 Home Premium
    • Windows 7 Professional
    • Windows 7 Starter
    • Windows 7 Ultimate
  • Windows Server 2008 R2 Service Pack 1, when used with:
    • 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: 
kbfix atdownload kbexpertisebeginner kbsurveynew KB2888049

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