Symptoms

Assume that you use the TCP receive window autotuning feature in a TCP connection on a computer that is running Windows Vista or Windows Server 2008. After some time, the feature is disabled. Additionally, it takes longer than expected to transfer a large amount of data over the connection.

Note This issue occurs when one of the following conditions is true:

  • A TCP SYN packet is sent multiple times over the TCP connection.

  • You create the TCP connection on a client computer that does not support the TCP window scaling feature. For example, you create the TCP connection on a computer that is running Windows XP.


Cause

This issue occurs because the TCP/IP driver disables the autotuning feature for all the connections on the computer. The driver does this when an incoming connection does not support the autotuning feature or when a TCP SYN packet is sent multiple times.

Note The expected behavior is that the driver disables the autotuning feature on specific TCP connections on the computer.

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=supportNote 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 Windows Vista Service Pack 2 (SP2) or Windows Server 2008 SP2.

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849How to obtain the latest service pack for Windows Server 2008

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

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 Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" 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.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • 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 Vista and for Windows Server 2008" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important 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.

File name

File version

File size

Date

Time

Platform

Tcpipreg.sys

6.0.6002.22947

31,232

10-Oct-2012

13:33

x86

Tcpip.sys

6.0.6002.22947

913,792

10-Oct-2012

18:24

x86


File name

File version

File size

Date

Time

Platform

Tcpipreg.sys

6.0.6002.22947

40,448

10-Oct-2012

14:18

x64

Tcpip.sys

6.0.6002.22947

1,419,136

10-Oct-2012

18:21

x64


File name

File version

File size

Date

Time

Platform

Tcpipreg.sys

6.0.6002.22947

80,896

10-Oct-2012

13:21

IA-64

Tcpip.sys

6.0.6002.22947

2,970,496

10-Oct-2012

18:10

IA-64




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 the autotuning feature, click the following article number to view the article in the Microsoft Knowledge Base:

947239 Description of the Receive Window Auto-Tuning feature for HTTP traffic on Windows Vista-based computers For more information about the autotuning feature issue, click the following article number to view the article in the Microsoft Knowledge Base:

983528 The TCP receive window autotuning feature does not work correctly in Windows Server 2008 R2 or in Windows 7 For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

File name

X86_4b1ac47af50bd56fe0da5ac38bc2ffef_31bf3856ad364e35_6.0.6002.22947_none_93afda4a405c7574.manifest

File version

Not applicable

File size

717

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable

File name

X86_eb08cb709d302520a558a7879e73bd5e_31bf3856ad364e35_6.0.6002.22947_none_3888924fa9404937.manifest

File version

Not applicable

File size

702

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable

File name

X86_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22947_none_88691bf21bcaf14c.manifest

File version

Not applicable

File size

4,845

Date (UTC)

10-Oct-2012

Time (UTC)

14:56

Platform

Not applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22947_none_b569f83d7cc437b6.manifest

File version

Not applicable

File size

6,762

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable


File name

Amd64_0c525e6367f18958157111ecd0ea3b99_31bf3856ad364e35_6.0.6002.22947_none_1c542b22386dc1cd.manifest

File version

Not applicable

File size

721

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable

File name

Amd64_28657665aa880961360cbc256f3b6ec7_31bf3856ad364e35_6.0.6002.22947_none_19aac74f80be0b98.manifest

File version

Not applicable

File size

706

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable

File name

Amd64_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22947_none_e487b775d4286282.manifest

File version

Not applicable

File size

5,122

Date (UTC)

10-Oct-2012

Time (UTC)

16:46

Platform

Not applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22947_none_118893c13521a8ec.manifest

File version

Not applicable

File size

6,784

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable


File name

Ia64_9a83afda69799f7bc3e0182a503c036c_31bf3856ad364e35_6.0.6002.22947_none_94eceb04e119ece9.manifest

File version

Not applicable

File size

1,066

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable

File name

Ia64_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22947_none_886abfe81bc8fa48.manifest

File version

Not applicable

File size

5,118

Date (UTC)

10-Oct-2012

Time (UTC)

14:30

Platform

Not applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22947_none_b56b9c337cc240b2.manifest

File version

Not applicable

File size

6,773

Date (UTC)

10-Oct-2012

Time (UTC)

18:27

Platform

Not applicable



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