Symptoms

Transmission Control Protocol (TCP) loopback latency and User Datagram Protocol (UDP) latency in Windows Server 2008, Windows Server 2008 R2, Windows Vista, and Windows 7 are longer than TCP loopback latency and UDP latency in Windows Server 2003.


This issue affects applications or services that use TCP loopback or UDP for communication.

Resolution

After you install the hotfix, TCP loopback latency or UDP latency is decreased. The decrease is between 5 percent and 25 percent.

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=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) , Windows Server 2008 SP2, Windows 7, or Windows Server 2008 R2 on the computer.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:

935791 How 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:

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

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 Server 2008 and for Windows Vista" 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.

For all supported x86-based versions of Windows Server 2008 SP2 and of Windows Vista SP2

File name

File version

File size

Date

Time

Platform

Tcpipreg.sys

6.0.6002.22320

31,232

23-Jan-2010

09:48

x86

Tcpip.sys

6.0.6002.22320

909,680

23-Jan-2010

12:18

x86

For all supported x64-based versions of Windows Server 2008 SP2 and of Windows Vista SP2

File name

File version

File size

Date

Time

Platform

Tcpipreg.sys

6.0.6002.22320

40,448

23-Jan-2010

10:05

x64

Tcpip.sys

6.0.6002.22320

1,421,168

23-Jan-2010

12:44

x64

For all supported IA-64-based versions of Windows Server 2008 SP2

File name

File version

File size

Date

Time

Platform

Tcpipreg.sys

6.0.6002.22320

80,896

23-Jan-2010

10:03

IA-64

Tcpip.sys

6.0.6002.22320

2,953,584

23-Jan-2010

12:34

IA-64

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 MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM 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.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Fwpkclnt.sys

6.1.7600.16385

187,472

14-Jul-2009

01:20

x86

Tcpip.sys

6.1.7600.20682

1,289,104

01-Apr-2010

19:03

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Fwpkclnt.sys

6.1.7600.16385

288,336

14-Jul-2009

01:47

x64

Tcpip.sys

6.1.7600.20682

1,892,232

01-Apr-2010

07:57

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Fwpkclnt.sys

6.1.7600.16385

482,896

14-Jul-2009

01:58

IA-64

Tcpip.sys

6.1.7600.20682

3,776,904

01-Apr-2010

18:02

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 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 Vista, Windows 7, Windows Server 2008, and Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows Vista SP2 and of Windows Server 2008 SP2

File name

Update.mum

File version

Not applicable

File size

3,230

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

File name

X86_6d62ea3e69fed6643acf3a3c6e4d56a2_31bf3856ad364e35_6.0.6002.22320_none_90ab04b4845be980.manifest

File version

Not applicable

File size

717

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

File name

X86_e96dc2462dacf54819d490aef004c0f6_31bf3856ad364e35_6.0.6002.22320_none_f1f0ef09d7b772f6.manifest

File version

Not applicable

File size

702

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

File name

X86_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22320_none_8877ae601bc1191f.manifest

File version

Not applicable

File size

4,845

Date (UTC)

23-Jan-2010

Time (UTC)

14:12

Platform

Not applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22320_none_b5788aab7cba5f89.manifest

File version

Not applicable

File size

6,400

Date (UTC)

23-Jan-2010

Time (UTC)

14:13

Platform

Not applicable

Additional files for all supported x64-based versions of Windows Vista SP2 and of Windows Server 2008 SP2

File name

Amd64_2f556adc70a01b1170fd381dcce4f76d_31bf3856ad364e35_6.0.6002.22320_none_54ca85d84ff41954.manifest

File version

Not applicable

File size

706

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

File name

Amd64_c9199e4a01ccdcf1ec382bdb9ea1ffe9_31bf3856ad364e35_6.0.6002.22320_none_06c44fdc6c66c553.manifest

File version

Not applicable

File size

721

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

File name

Amd64_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22320_none_e49649e3d41e8a55.manifest

File version

Not applicable

File size

5,122

Date (UTC)

23-Jan-2010

Time (UTC)

14:46

Platform

Not applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22320_none_1197262f3517d0bf.manifest

File version

Not applicable

File size

6,422

Date (UTC)

23-Jan-2010

Time (UTC)

14:47

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,256

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 SP2

File name

Ia64_7393f99aa4132cb873e89e2bf20de8e4_31bf3856ad364e35_6.0.6002.22320_none_3d8c8864b33b8c10.manifest

File version

Not applicable

File size

1,066

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

File name

Ia64_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22320_none_887952561bbf221b.manifest

File version

Not applicable

File size

5,118

Date (UTC)

23-Jan-2010

Time (UTC)

14:01

Platform

Not applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22320_none_b57a2ea17cb86885.manifest

File version

Not applicable

File size

6,411

Date (UTC)

23-Jan-2010

Time (UTC)

14:02

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,247

Date (UTC)

25-Jan-2010

Time (UTC)

05:40

Platform

Not applicable

Additional files for all supported x86-based versions of Windows 7

File name

Package_1_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,820

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

Package_2_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,825

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

Package_for_kb979612_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,947

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

X86_3b8cf45d13d2d4ef90a68a6faaba67da_31bf3856ad364e35_6.1.7600.20682_none_c62e309e80eb40b7.manifest

File version

Not Applicable

File size

702

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20682_none_b37b082ee0da247a.manifest

File version

Not Applicable

File size

3,780

Date (UTC)

02-Apr-2010

Time (UTC)

03:39

Platform

Not Applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Package_1_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,820

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

Package_2_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,825

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

Package_for_kb979612_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,947

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

X86_3b8cf45d13d2d4ef90a68a6faaba67da_31bf3856ad364e35_6.1.7600.20682_none_c62e309e80eb40b7.manifest

File version

Not Applicable

File size

702

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20682_none_b37b082ee0da247a.manifest

File version

Not Applicable

File size

3,780

Date (UTC)

02-Apr-2010

Time (UTC)

03:39

Platform

Not Applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_4dc683317409f25af8c7548172e4360e_31bf3856ad364e35_6.1.7600.20682_none_ac406fc7b18db5bb.manifest

File version

Not Applicable

File size

704

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20682_none_b37cac24e0d82d76.manifest

File version

Not Applicable

File size

3,782

Date (UTC)

02-Apr-2010

Time (UTC)

03:37

Platform

Not Applicable

File name

Package_1_for_kb979612~31bf3856ad364e35~ia64~~6.1.1.0.mum

File version

Not Applicable

File size

2,051

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

File name

Package_for_kb979612_rtm~31bf3856ad364e35~ia64~~6.1.1.0.mum

File version

Not Applicable

File size

1,683

Date (UTC)

01-Apr-2010

Time (UTC)

23:30

Platform

Not Applicable

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