Increased latency occurs on an HTTP connection to a computer that is running Windows Vista, Windows 7, Windows Server 2008 or Windows Server 2008 R2 if the connection is through a load balancer

Symptoms

Consider the following scenario in a network environment:In this scenario, new HTTP client requests may be delayed. Additionally, clients may receive errors when they try to access the web service.

Note The HTTP protocol stack (Http.sys) is used on the computer to receive HTTP requests from clients.

Cause

The issue occurs because some HTTP requests from clients may include zero-length data in their SSL records. These zero-length data records cause certain server-side variables not to update correctly. If a client closes their connection to the web service and the last packet that was sent contained a zero-length data record, then Http.sys cannot adjust certain necessary variables. Therefore, Http.sys leaves the connection in the CLOSE_WAIT state. With time, the computer may reach its open connection limit. When this occurs, no new connections are accepted by the computer.

Note The CLOSE_WAIT state indicates a passive close. Specifically, it indicates that the server has only received the first FIN flag from a client.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that 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: 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 one of the following operating systems:
  • Windows Vista Service Pack 2 (SP2)
  • Windows Server 2008 Service Pack 2 (SP2)
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2 Service Pack 1 (SP1)
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

For more information about how to obtain a Windows 7 or a 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 use the hotfix in this package, 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.
    VersionProductSR_LevelService branch
    6.0.600
    2.
    22xxx
    Windows 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 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 Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Httpapi.dll6.0.6002.2273030,72021-Oct-201116:50x86
Http.sys6.0.6002.22730413,69621-Oct-201114:22x86
For all supported x64-based versions of Windows Server 2008 and of WindowsVista
File nameFile versionFile sizeDateTimePlatform
Httpapi.dll6.0.6002.2273033,79221-Oct-201116:03x64
Http.sys6.0.6002.22730620,03221-Oct-201114:21x64
Httpapi.dll6.0.6002.2273030,72021-Oct-201116:50x86
For all supported IA-64-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Httpapi.dll6.0.6002.2273070,65621-Oct-201116:09IA-64
Http.sys6.0.6002.227301,184,25621-Oct-201114:48IA-64
Httpapi.dll6.0.6002.2273030,72021-Oct-201116:50x86
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.
    VersionProductSR_LevelService branch
    6.1.760
    1.
    21xxx
    Windows 7 and Windows Server 2008 R2SP1LDR
  • 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 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
File nameFile versionFile sizeDateTimePlatform
Http.sys6.1.7601.21866514,04824-Nov-201104:07x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Http.sys6.1.7601.21866753,15224-Nov-201104:21x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Http.sys6.1.7601.218661,443,32824-Nov-201103:18IA-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 and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008
File nameUpdate.mum
File versionNot Applicable
File size3,078
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameX86_c47763fe43b596d90c7c2775ee0dd650_31bf3856ad364e35_6.0.6002.22730_none_8251eeda0bf7e32b.manifest
File versionNot Applicable
File size692
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameX86_ff124962614b4aa88f3c4a799f67e90d_31bf3856ad364e35_6.0.6002.22730_none_1dc1c2856de67291.manifest
File versionNot Applicable
File size696
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameX86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fbed04b3a808f3.manifest
File versionNot Applicable
File size4,708
Date (UTC)21-Oct-2011
Time (UTC)17:19
File nameX86_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22730_none_af10ac4e2f371c38.manifest
File versionNot Applicable
File size144,703
Date (UTC)21-Oct-2011
Time (UTC)17:22
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
File nameAmd64_0e9954aa710303e9af470f9a20c3059c_31bf3856ad364e35_6.0.6002.22730_none_21fab38a641ad3a4.manifest
File versionNot Applicable
File size696
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameAmd64_8a8744d23e5e10508bc31b129adf52c8_31bf3856ad364e35_6.0.6002.22730_none_eb078c334feb142f.manifest
File versionNot Applicable
File size1,040
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameAmd64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_541a88886c057a29.manifest
File versionNot Applicable
File size4,722
Date (UTC)21-Oct-2011
Time (UTC)16:24
File nameAmd64_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22730_none_0b2f47d1e7948d6e.manifest
File versionNot Applicable
File size144,967
Date (UTC)21-Oct-2011
Time (UTC)16:27
File nameUpdate.mum
File versionNot Applicable
File size3,102
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameX86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fbed04b3a808f3.manifest
File versionNot Applicable
File size4,708
Date (UTC)21-Oct-2011
Time (UTC)17:19
Additional files for all supported IA-64-based versions of Windows Server 2008
File nameIa64_937486422ecc087ca477812bfb385618_31bf3856ad364e35_6.0.6002.22730_none_e0fbc49508dda0f2.manifest
File versionNot Applicable
File size1,038
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameIa64_eb83b60347c51700d8462c02cebfe561_31bf3856ad364e35_6.0.6002.22730_none_69056b4620ca06a1.manifest
File versionNot Applicable
File size694
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameIa64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fd90fab3a611ef.manifest
File versionNot Applicable
File size4,715
Date (UTC)21-Oct-2011
Time (UTC)16:24
File nameIa64_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22730_none_af1250442f352534.manifest
File versionNot Applicable
File size144,957
Date (UTC)21-Oct-2011
Time (UTC)16:25
File nameUpdate.mum
File versionNot Applicable
File size2,257
Date (UTC)21-Oct-2011
Time (UTC)19:47
File nameX86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fbed04b3a808f3.manifest
File versionNot Applicable
File size4,708
Date (UTC)21-Oct-2011
Time (UTC)17:19

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
File nameUpdate.mum
File versionNot Applicable
File size1,643
Date (UTC)24-Nov-2011
Time (UTC)20:02
PlatformNot Applicable
File nameX86_4ceec32f5d8414531ede36ac95044832_31bf3856ad364e35_6.1.7601.21866_none_2cc2f90bda288c6f.manifest
File versionNot Applicable
File size692
Date (UTC)24-Nov-2011
Time (UTC)20:02
PlatformNot Applicable
File nameX86_microsoft-windows-http_31bf3856ad364e35_6.1.7601.21866_none_af1df7c390615e9e.manifest
File versionNot Applicable
File size175,661
Date (UTC)24-Nov-2011
Time (UTC)07:20
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_eb485ff954d31e1eb9389feab3b6cb3d_31bf3856ad364e35_6.1.7601.21866_none_3b57c8a52d3ae06c.manifest
File versionNot Applicable
File size696
Date (UTC)24-Nov-2011
Time (UTC)20:02
PlatformNot Applicable
File nameAmd64_microsoft-windows-http_31bf3856ad364e35_6.1.7601.21866_none_0b3c934748becfd4.manifest
File versionNot Applicable
File size175,667
Date (UTC)24-Nov-2011
Time (UTC)08:08
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,853
Date (UTC)24-Nov-2011
Time (UTC)20:02
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_37b5b558ad5281f555e3c3726aa4cd3b_31bf3856ad364e35_6.1.7601.21866_none_c22af9b48ee5dfdb.manifest
File versionNot Applicable
File size694
Date (UTC)24-Nov-2011
Time (UTC)20:02
PlatformNot Applicable
File nameIa64_microsoft-windows-http_31bf3856ad364e35_6.1.7601.21866_none_af1f9bb9905f679a.manifest
File versionNot Applicable
File size175,664
Date (UTC)24-Nov-2011
Time (UTC)07:38
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,447
Date (UTC)24-Nov-2011
Time (UTC)20:02
PlatformNot Applicable
Vlastnosti

ID článku: 2634328 – Posledná kontrola: 11. 1. 2012 – Revízia: 1

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