Symptoms

Consider the following scenario in a network environment:

  • A web service is hosted on a computer that is running one of the following operating systems:

    • Windows Vista

    • Windows Server 2008

    • Windows 7

    • Windows Server 2008 R2

    For example, Internet Information Services (IIS) or an application that uses the System.Net.HttpListener class is installed.

  • A network load balancer is deployed in the network environment.

  • Some clients send HTTP requests to the computer by using the TLS/SSL protocol.

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:

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 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.

    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 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 name

File version

File size

Date

Time

Platform

Httpapi.dll

6.0.6002.22730

30,720

21-Oct-2011

16:50

x86

Http.sys

6.0.6002.22730

413,696

21-Oct-2011

14:22

x86

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

File name

File version

File size

Date

Time

Platform

Httpapi.dll

6.0.6002.22730

33,792

21-Oct-2011

16:03

x64

Http.sys

6.0.6002.22730

620,032

21-Oct-2011

14:21

x64

Httpapi.dll

6.0.6002.22730

30,720

21-Oct-2011

16:50

x86

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

File name

File version

File size

Date

Time

Platform

Httpapi.dll

6.0.6002.22730

70,656

21-Oct-2011

16:09

IA-64

Http.sys

6.0.6002.22730

1,184,256

21-Oct-2011

14:48

IA-64

Httpapi.dll

6.0.6002.22730

30,720

21-Oct-2011

16:50

x86

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.

    Version

    Product

    SR_Level

    Service branch

    6.1.760
    1.
    21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    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 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 name

File version

File size

Date

Time

Platform

Http.sys

6.1.7601.21866

514,048

24-Nov-2011

04:07

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

Http.sys

6.1.7601.21866

753,152

24-Nov-2011

04:21

x64

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

File name

File version

File size

Date

Time

Platform

Http.sys

6.1.7601.21866

1,443,328

24-Nov-2011

03:18

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 and for Windows Server 2008

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

File name

Update.mum

File version

Not Applicable

File size

3,078

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

X86_c47763fe43b596d90c7c2775ee0dd650_31bf3856ad364e35_6.0.6002.22730_none_8251eeda0bf7e32b.manifest

File version

Not Applicable

File size

692

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

X86_ff124962614b4aa88f3c4a799f67e90d_31bf3856ad364e35_6.0.6002.22730_none_1dc1c2856de67291.manifest

File version

Not Applicable

File size

696

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fbed04b3a808f3.manifest

File version

Not Applicable

File size

4,708

Date (UTC)

21-Oct-2011

Time (UTC)

17:19

File name

X86_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22730_none_af10ac4e2f371c38.manifest

File version

Not Applicable

File size

144,703

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 name

Amd64_0e9954aa710303e9af470f9a20c3059c_31bf3856ad364e35_6.0.6002.22730_none_21fab38a641ad3a4.manifest

File version

Not Applicable

File size

696

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

Amd64_8a8744d23e5e10508bc31b129adf52c8_31bf3856ad364e35_6.0.6002.22730_none_eb078c334feb142f.manifest

File version

Not Applicable

File size

1,040

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

Amd64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_541a88886c057a29.manifest

File version

Not Applicable

File size

4,722

Date (UTC)

21-Oct-2011

Time (UTC)

16:24

File name

Amd64_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22730_none_0b2f47d1e7948d6e.manifest

File version

Not Applicable

File size

144,967

Date (UTC)

21-Oct-2011

Time (UTC)

16:27

File name

Update.mum

File version

Not Applicable

File size

3,102

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fbed04b3a808f3.manifest

File version

Not Applicable

File size

4,708

Date (UTC)

21-Oct-2011

Time (UTC)

17:19

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

File name

Ia64_937486422ecc087ca477812bfb385618_31bf3856ad364e35_6.0.6002.22730_none_e0fbc49508dda0f2.manifest

File version

Not Applicable

File size

1,038

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

Ia64_eb83b60347c51700d8462c02cebfe561_31bf3856ad364e35_6.0.6002.22730_none_69056b4620ca06a1.manifest

File version

Not Applicable

File size

694

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

Ia64_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fd90fab3a611ef.manifest

File version

Not Applicable

File size

4,715

Date (UTC)

21-Oct-2011

Time (UTC)

16:24

File name

Ia64_microsoft-windows-http_31bf3856ad364e35_6.0.6002.22730_none_af1250442f352534.manifest

File version

Not Applicable

File size

144,957

Date (UTC)

21-Oct-2011

Time (UTC)

16:25

File name

Update.mum

File version

Not Applicable

File size

2,257

Date (UTC)

21-Oct-2011

Time (UTC)

19:47

File name

X86_microsoft-windows-http-api_31bf3856ad364e35_6.0.6002.22730_none_f7fbed04b3a808f3.manifest

File version

Not Applicable

File size

4,708

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 name

Update.mum

File version

Not Applicable

File size

1,643

Date (UTC)

24-Nov-2011

Time (UTC)

20:02

Platform

Not Applicable

File name

X86_4ceec32f5d8414531ede36ac95044832_31bf3856ad364e35_6.1.7601.21866_none_2cc2f90bda288c6f.manifest

File version

Not Applicable

File size

692

Date (UTC)

24-Nov-2011

Time (UTC)

20:02

Platform

Not Applicable

File name

X86_microsoft-windows-http_31bf3856ad364e35_6.1.7601.21866_none_af1df7c390615e9e.manifest

File version

Not Applicable

File size

175,661

Date (UTC)

24-Nov-2011

Time (UTC)

07:20

Platform

Not Applicable

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

File name

Amd64_eb485ff954d31e1eb9389feab3b6cb3d_31bf3856ad364e35_6.1.7601.21866_none_3b57c8a52d3ae06c.manifest

File version

Not Applicable

File size

696

Date (UTC)

24-Nov-2011

Time (UTC)

20:02

Platform

Not Applicable

File name

Amd64_microsoft-windows-http_31bf3856ad364e35_6.1.7601.21866_none_0b3c934748becfd4.manifest

File version

Not Applicable

File size

175,667

Date (UTC)

24-Nov-2011

Time (UTC)

08:08

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,853

Date (UTC)

24-Nov-2011

Time (UTC)

20:02

Platform

Not Applicable

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

File name

Ia64_37b5b558ad5281f555e3c3726aa4cd3b_31bf3856ad364e35_6.1.7601.21866_none_c22af9b48ee5dfdb.manifest

File version

Not Applicable

File size

694

Date (UTC)

24-Nov-2011

Time (UTC)

20:02

Platform

Not Applicable

File name

Ia64_microsoft-windows-http_31bf3856ad364e35_6.1.7601.21866_none_af1f9bb9905f679a.manifest

File version

Not Applicable

File size

175,664

Date (UTC)

24-Nov-2011

Time (UTC)

07:38

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,447

Date (UTC)

24-Nov-2011

Time (UTC)

20:02

Platform

Not Applicable

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