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Article ID: 979612 - Last Review: January 20, 2011 - Revision: 1.0

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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=support (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 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  (http://support.microsoft.com/kb/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  (http://support.microsoft.com/kb/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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.0.600 2 . 22xxxWindows Vista and Windows Server 2008SP2LDR
  • 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Tcpipreg.sys6.0.6002.2232031,23223-Jan-201009:48x86
Tcpip.sys6.0.6002.22320909,68023-Jan-201012:18x86
For all supported x64-based versions of Windows Server 2008 SP2 and of Windows Vista SP2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Tcpipreg.sys6.0.6002.2232040,44823-Jan-201010:05x64
Tcpip.sys6.0.6002.223201,421,16823-Jan-201012:44x64
For all supported IA-64-based versions of Windows Server 2008 SP2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Tcpipreg.sys6.0.6002.2232080,89623-Jan-201010:03IA-64
Tcpip.sys6.0.6002.223202,953,58423-Jan-201012:34IA-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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Fwpkclnt.sys6.1.7600.16385187,47214-Jul-200901:20x86
Tcpip.sys6.1.7600.206821,289,10401-Apr-201019:03x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Fwpkclnt.sys6.1.7600.16385288,33614-Jul-200901:47x64
Tcpip.sys6.1.7600.206821,892,23201-Apr-201007:57x64
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Fwpkclnt.sys6.1.7600.16385482,89614-Jul-200901:58IA-64
Tcpip.sys6.1.7600.206823,776,90401-Apr-201018:02IA-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  (http://support.microsoft.com/kb/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
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot applicable
File size3,230
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
File nameX86_6d62ea3e69fed6643acf3a3c6e4d56a2_31bf3856ad364e35_6.0.6002.22320_none_90ab04b4845be980.manifest
File versionNot applicable
File size717
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
File nameX86_e96dc2462dacf54819d490aef004c0f6_31bf3856ad364e35_6.0.6002.22320_none_f1f0ef09d7b772f6.manifest
File versionNot applicable
File size702
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
File nameX86_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22320_none_8877ae601bc1191f.manifest
File versionNot applicable
File size4,845
Date (UTC)23-Jan-2010
Time (UTC)14:12
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22320_none_b5788aab7cba5f89.manifest
File versionNot applicable
File size6,400
Date (UTC)23-Jan-2010
Time (UTC)14:13
PlatformNot applicable
Additional files for all supported x64-based versions of Windows Vista SP2 and of Windows Server 2008 SP2
Collapse this tableExpand this table
File nameAmd64_2f556adc70a01b1170fd381dcce4f76d_31bf3856ad364e35_6.0.6002.22320_none_54ca85d84ff41954.manifest
File versionNot applicable
File size706
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
File nameAmd64_c9199e4a01ccdcf1ec382bdb9ea1ffe9_31bf3856ad364e35_6.0.6002.22320_none_06c44fdc6c66c553.manifest
File versionNot applicable
File size721
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
File nameAmd64_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22320_none_e49649e3d41e8a55.manifest
File versionNot applicable
File size5,122
Date (UTC)23-Jan-2010
Time (UTC)14:46
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22320_none_1197262f3517d0bf.manifest
File versionNot applicable
File size6,422
Date (UTC)23-Jan-2010
Time (UTC)14:47
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size3,256
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 SP2
Collapse this tableExpand this table
File nameIa64_7393f99aa4132cb873e89e2bf20de8e4_31bf3856ad364e35_6.0.6002.22320_none_3d8c8864b33b8c10.manifest
File versionNot applicable
File size1,066
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
File nameIa64_microsoft-windows-l..istry-support-tcpip_31bf3856ad364e35_6.0.6002.22320_none_887952561bbf221b.manifest
File versionNot applicable
File size5,118
Date (UTC)23-Jan-2010
Time (UTC)14:01
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6002.22320_none_b57a2ea17cb86885.manifest
File versionNot applicable
File size6,411
Date (UTC)23-Jan-2010
Time (UTC)14:02
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,247
Date (UTC)25-Jan-2010
Time (UTC)05:40
PlatformNot applicable
Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File namePackage_1_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,820
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File namePackage_2_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,825
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File namePackage_for_kb979612_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,947
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File nameX86_3b8cf45d13d2d4ef90a68a6faaba67da_31bf3856ad364e35_6.1.7600.20682_none_c62e309e80eb40b7.manifest
File versionNot Applicable
File size702
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20682_none_b37b082ee0da247a.manifest
File versionNot Applicable
File size3,780
Date (UTC)02-Apr-2010
Time (UTC)03:39
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 namePackage_1_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,820
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File namePackage_2_for_kb979612~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,825
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File namePackage_for_kb979612_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,947
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File nameX86_3b8cf45d13d2d4ef90a68a6faaba67da_31bf3856ad364e35_6.1.7600.20682_none_c62e309e80eb40b7.manifest
File versionNot Applicable
File size702
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20682_none_b37b082ee0da247a.manifest
File versionNot Applicable
File size3,780
Date (UTC)02-Apr-2010
Time (UTC)03:39
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_4dc683317409f25af8c7548172e4360e_31bf3856ad364e35_6.1.7600.20682_none_ac406fc7b18db5bb.manifest
File versionNot Applicable
File size704
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.20682_none_b37cac24e0d82d76.manifest
File versionNot Applicable
File size3,782
Date (UTC)02-Apr-2010
Time (UTC)03:37
PlatformNot Applicable
File namePackage_1_for_kb979612~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size2,051
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable
File namePackage_for_kb979612_rtm~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,683
Date (UTC)01-Apr-2010
Time (UTC)23:30
PlatformNot Applicable

APPLIES TO
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Starter
  • Windows Vista Ultimate
  • Windows HPC Server 2008
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Foundation
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows Web Server 2008
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Microsoft Exchange Server 2007 Enterprise Edition
  • Microsoft Exchange Server 2007 Standard Edition
  • Microsoft Exchange Server 2007 Service Pack 1
  • Microsoft Exchange Server 2007 Service Pack 2
  • Microsoft Exchange Server 2007 Service Pack 3
  • Microsoft Exchange Server 2010 Enterprise
  • Microsoft Exchange Server 2010 Standard
  • Microsoft Exchange Server 2010 Service Pack 1
Keywords: 
kbsurveynew kbexpertiseadvanced kbqfe kbautohotfix kbHotfixServer kbfix KB979612
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