Data transfer stops for five seconds in a Windows Socket-based application in Windows 7 and Windows Server 2008 R2

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Article ID: 2861819 - View products that this article applies to.
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Symptoms

Assume that you use a Windows Socket-based application to send data locally between a client and a server that are running Windows 7 or Windows Server 2008 R2. In this situation, the data transfer stops intermittently or is delayed for five seconds.

Cause

This problem occurs because of the Silly Window Syndrome (SWS) avoidance timer. The SWS timer is scheduled to send the remaining data bytes, and this represents less than one maximum segment size (MSS) or 1,460 bytes. Additionally, the receiver is supposed to send an acknowledgement (ACK) message that advertises the increased receive window and indicates that the remaining data bytes can be sent. However, if the receiver sends an ACK within 5 seconds when it has a sufficient buffer, the SWS timer cannot recover the five-second delay status because of a race condition. The race condition exists when packets reach the destination in reverse order.

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
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 Service Pack 1 for Windows 7 or Windows Server 2008 R2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

File information

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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 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, 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 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1 . 18xxxWindows 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, 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 7 and 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 x86-based versions of Windows 7
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.17939240,49622-Aug-201217:16x86
Netio.sys6.1.7601.22382240,57612-Jul-201311:12x86
Fwpkclnt.sys6.1.7601.18042187,75203-Jan-201305:04x86
Tcpip.sys6.1.7601.182081,294,27212-Jul-201311:48x86
Fwpkclnt.sys6.1.7601.22382187,84012-Jul-201311:11x86
Tcpip.sys6.1.7601.223821,309,12012-Jul-201311:12x86
For all supported x64-based versions of Windows 7 and Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.17939376,68822-Aug-201218:12x64
Netio.sys6.1.7601.22382376,76812-Jul-201312:07x64
Fwpkclnt.sys6.1.7601.18042288,08803-Jan-201306:00x64
Tcpip.sys6.1.7601.182081,909,69612-Jul-201312:35x64
Fwpkclnt.sys6.1.7601.22382288,19212-Jul-201312:06x64
Tcpip.sys6.1.7601.223821,901,50412-Jul-201312:07x64
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-201216:51IA-64
Netio.sys6.1.7601.22382711,10412-Jul-201311:09IA-64
Fwpkclnt.sys6.1.7601.18042482,15203-Jan-201304:45IA-64
Tcpip.sys6.1.7601.182083,797,95212-Jul-201311:28IA-64
Fwpkclnt.sys6.1.7601.22382482,24012-Jul-201311:09IA-64
Tcpip.sys6.1.7601.223823,823,04012-Jul-201311:09IA-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.

References

For information about SWS, see Internet RFC 813 and Internet RFC 1122.

For information about MSS, See Internet RFC 879.

See the terminology Microsoft uses to describe 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 namePackage_1_for_kb2861819_bf~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size2,003
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_1_for_kb2861819~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size2,944
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_2_for_kb2861819_bf~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,986
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_2_for_kb2861819~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size2,927
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_3_for_kb2861819_bf~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,988
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_3_for_kb2861819~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size2,929
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_rtm_bf~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,440
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,459
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_sp1_bf~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,883
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_sp1~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,918
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameUpdate-bf.mum
File versionNot Applicable
File size2,094
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameX86_e54d468aad41772a8a53a914b3f20811_31bf3856ad364e35_6.1.7601.17939_none_6d59103b240c8f78.manifest
File versionNot Applicable
File size1,054
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameX86_ece2dfb79765953260f9a87616503f28_31bf3856ad364e35_6.1.7601.22382_none_52faf6e61da18d21.manifest
File versionNot Applicable
File size1,054
Date (UTC)12-Jul-2013
Time (UTC)22:08
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_6.1.7601.22382_none_58dea70a2ce7f349.manifest
File versionNot Applicable
File size2,540
Date (UTC)12-Jul-2013
Time (UTC)11:36
PlatformNot Applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18208_none_b53430d7c49cc598.manifest
File versionNot Applicable
File size3,780
Date (UTC)12-Jul-2013
Time (UTC)22:11
PlatformNot Applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22382_none_b5614c86de00ace0.manifest
File versionNot Applicable
File size3,834
Date (UTC)12-Jul-2013
Time (UTC)11:38
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_046ce52c46feb15b6a01f4b50a0489f0_31bf3856ad364e35_6.1.7601.22382_none_9a7eea0840ca5d01.manifest
File versionNot Applicable
File size712
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameAmd64_508d613fec6eb2ca7dd97be408d204f9_31bf3856ad364e35_6.1.7601.17939_none_a95dd5fd26bf04e6.manifest
File versionNot Applicable
File size1,060
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameAmd64_d8c416d0121a7299f5e416f0a3d2351e_31bf3856ad364e35_6.1.7601.17939_none_ff65e9de4b9b2422.manifest
File versionNot Applicable
File size1,414
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameAmd64_f0ed83bda0697abd97fd471015aed5c2_31bf3856ad364e35_6.1.7601.17939_none_f48525cb7b29d619.manifest
File versionNot Applicable
File size712
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameAmd64_f1fbb871a3c173b6bf7c5bf5ddf8ea85_31bf3856ad364e35_6.1.7601.22382_none_02aa515b2fa4722f.manifest
File versionNot Applicable
File size1,060
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameAmd64_f68e4e16b1cb69c92901621777cec1de_31bf3856ad364e35_6.1.7601.22382_none_c8e83fe986f18a1e.manifest
File versionNot Applicable
File size1,414
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_b4b0db76cbf8bcd1.manifest
File versionNot Applicable
File size2,542
Date (UTC)22-Aug-2012
Time (UTC)18:33
PlatformNot Applicable
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22382_none_b4fd428de545647f.manifest
File versionNot Applicable
File size2,542
Date (UTC)12-Jul-2013
Time (UTC)12:31
PlatformNot Applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18208_none_1152cc5b7cfa36ce.manifest
File versionNot Applicable
File size3,784
Date (UTC)12-Jul-2013
Time (UTC)22:15
PlatformNot Applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22382_none_117fe80a965e1e16.manifest
File versionNot Applicable
File size3,838
Date (UTC)12-Jul-2013
Time (UTC)12:35
PlatformNot Applicable
File namePackage_1_for_kb2861819_bf~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,015
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_1_for_kb2861819~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,962
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_2_for_kb2861819_bf~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,196
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_2_for_kb2861819~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size4,332
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_3_for_kb2861819_bf~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,194
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_3_for_kb2861819~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size4,550
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_4_for_kb2861819_bf~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,222
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_4_for_kb2861819~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size3,408
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_rtm_bf~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,448
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,468
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_sp1_bf~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,771
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_sp1~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size2,833
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameUpdate-bf.mum
File versionNot Applicable
File size2,719
Date (UTC)12-Jul-2013
Time (UTC)22:08
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_6.1.7601.22382_none_bf51ece019a6267a.manifest
File versionNot Applicable
File size1,166
Date (UTC)12-Jul-2013
Time (UTC)11:20
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_0e54a997dfbffcb492837f5fc6a4fa19_31bf3856ad364e35_6.1.7601.17939_none_bd33bbc9d426bebf.manifest
File versionNot Applicable
File size1,411
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameIa64_d1ed13831dbbab8c402753f01d733f5a_31bf3856ad364e35_6.1.7601.22382_none_14249665541f5c5a.manifest
File versionNot Applicable
File size1,411
Date (UTC)12-Jul-2013
Time (UTC)22:08
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_6.1.7601.22382_none_58e04b002ce5fc45.manifest
File versionNot Applicable
File size2,541
Date (UTC)12-Jul-2013
Time (UTC)11:34
PlatformNot Applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18208_none_b535d4cdc49ace94.manifest
File versionNot Applicable
File size3,782
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22382_none_b562f07cddfeb5dc.manifest
File versionNot Applicable
File size3,836
Date (UTC)12-Jul-2013
Time (UTC)11:36
PlatformNot Applicable
File namePackage_1_for_kb2861819_bf~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size2,214
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_1_for_kb2861819~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size3,396
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_sp1_bf~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,427
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File namePackage_for_kb2861819_sp1~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,446
Date (UTC)12-Jul-2013
Time (UTC)22:08
PlatformNot Applicable
File nameUpdate-bf.mum
File versionNot Applicable
File size1,425
Date (UTC)12-Jul-2013
Time (UTC)22:08
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_6.1.7601.22382_none_bf51ece019a6267a.manifest
File versionNot Applicable
File size1,166
Date (UTC)12-Jul-2013
Time (UTC)11:20
PlatformNot Applicable
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Properties

Article ID: 2861819 - Last Review: August 13, 2013 - Revision: 1.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseinter kbsurveynew kbbug KB2861819

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