Symptoms

Consider the following scenario. You use Background Intelligent Transfer Service (BITS) to download files on a computer that is running Windows 7 or Windows Server 2008 R2. You enable Kerberos authentication. In this scenario, the BITS client resets the TCP connection every time that it finishes downloading a range of the file. This behavior causes the total network traffic to increase.

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 one of the following operating systems:

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 or 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 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 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, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.7600.21xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.7601.21xxx

    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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical 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

Webio.dll

6.1.7600.21108

314,880

16-Dec-2011

07:51

Webio.dll

6.1.7601.21878

315,392

16-Dec-2011

09:00

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

File name

File version

File size

Date

Time

Platform

Webio.dll

6.1.7600.21108

396,288

16-Dec-2011

08:41

x64

Webio.dll

6.1.7601.21878

396,288

16-Dec-2011

08:39

x64

Webio.dll

6.1.7600.21108

314,880

16-Dec-2011

07:51

x86

Webio.dll

6.1.7601.21878

315,392

16-Dec-2011

09:00

x86

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

File name

File version

File size

Date

Time

Platform

Webio.dll

6.1.7600.21108

691,712

16-Dec-2011

07:37

IA-64

Webio.dll

6.1.7601.21878

692,224

16-Dec-2011

07:33

IA-64

Webio.dll

6.1.7600.21108

314,880

16-Dec-2011

07:51

x86

Webio.dll

6.1.7601.21878

315,392

16-Dec-2011

09:00

x86

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 Background Intelligent Transfer Service (BITS), visit the following Microsoft websites:

General information about BITS

More detailed information about BITSFor 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 7 and for Windows Server 2008 R2

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

File name

X86_87f75ac12a446ceb6b99a2ca4af76a36_31bf3856ad364e35_6.1.7601.21878_none_13c66f82a02979e0.manifest

File version

Not applicable

File size

693

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

X86_96ba8bf47d0737c5105f4f5bedb0768b_31bf3856ad364e35_6.1.7600.21108_none_01e454b9c8b421f0.manifest

File version

Not applicable

File size

693

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

X86_microsoft-windows-webio_31bf3856ad364e35_6.1.7600.21108_none_5da390d058e0fe60.manifest

File version

Not applicable

File size

2,484

Date (UTC)

16-Dec-2011

Time (UTC)

09:32

File name

X86_microsoft-windows-webio_31bf3856ad364e35_6.1.7601.21878_none_5f3e6640563ffaa1.manifest

File version

Not applicable

File size

2,484

Date (UTC)

16-Dec-2011

Time (UTC)

09:26

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

File name

Amd64_437d7e4598301a23da920e42406616e0_31bf3856ad364e35_6.1.7600.21108_none_65234735d8ea11be.manifest

File version

Not applicable

File size

697

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Amd64_57a039ee7e17a440b71730eeb49f6391_31bf3856ad364e35_6.1.7600.21108_none_0afb4fe2b245f27d.manifest

File version

Not applicable

File size

697

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Amd64_92bbda002575b1fcc5ad245bc570fbce_31bf3856ad364e35_6.1.7600.21108_none_3ee3d28aeb93c701.manifest

File version

Not applicable

File size

1,036

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Amd64_bfc7fbfa102a5bc5f49c7f04a8bd2c4f_31bf3856ad364e35_6.1.7601.21878_none_977331ab075ea243.manifest

File version

Not applicable

File size

1,036

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Amd64_e7e8bb6fc595a6732a234d1059c888b5_31bf3856ad364e35_6.1.7601.21878_none_2d9098d797a98a75.manifest

File version

Not applicable

File size

697

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Amd64_eb480e7208f3141609d65808135de8f3_31bf3856ad364e35_6.1.7601.21878_none_b5a158d1802e0697.manifest

File version

Not applicable

File size

697

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Amd64_microsoft-windows-webio_31bf3856ad364e35_6.1.7600.21108_none_b9c22c54113e6f96.manifest

File version

Not applicable

File size

2,488

Date (UTC)

16-Dec-2011

Time (UTC)

09:09

File name

Amd64_microsoft-windows-webio_31bf3856ad364e35_6.1.7601.21878_none_bb5d01c40e9d6bd7.manifest

File version

Not applicable

File size

2,488

Date (UTC)

16-Dec-2011

Time (UTC)

10:22

File name

Wow64_microsoft-windows-webio_31bf3856ad364e35_6.1.7600.21108_none_c416d6a6459f3191.manifest

File version

Not applicable

File size

2,486

Date (UTC)

16-Dec-2011

Time (UTC)

09:23

File name

Wow64_microsoft-windows-webio_31bf3856ad364e35_6.1.7601.21878_none_c5b1ac1642fe2dd2.manifest

File version

Not applicable

File size

2,486

Date (UTC)

16-Dec-2011

Time (UTC)

09:15

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

File name

Ia64_964c407b708fed740166c293887c1b55_31bf3856ad364e35_6.1.7600.21108_none_7ccb47c924849058.manifest

File version

Not applicable

File size

1,034

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Ia64_97f9d6f6755f259e00fbc7fcec05884b_31bf3856ad364e35_6.1.7601.21878_none_b01f0bbdba93879d.manifest

File version

Not applicable

File size

1,034

Date (UTC)

16-Dec-2011

Time (UTC)

19:50

File name

Ia64_microsoft-windows-webio_31bf3856ad364e35_6.1.7600.21108_none_5da534c658df075c.manifest

File version

Not applicable

File size

2,486

Date (UTC)

16-Dec-2011

Time (UTC)

09:06

File name

Ia64_microsoft-windows-webio_31bf3856ad364e35_6.1.7601.21878_none_5f400a36563e039d.manifest

File version

Not applicable

File size

2,486

Date (UTC)

16-Dec-2011

Time (UTC)

10:16

File name

Wow64_microsoft-windows-webio_31bf3856ad364e35_6.1.7600.21108_none_c416d6a6459f3191.manifest

File version

Not applicable

File size

2,486

Date (UTC)

16-Dec-2011

Time (UTC)

09:23

File name

Wow64_microsoft-windows-webio_31bf3856ad364e35_6.1.7601.21878_none_c5b1ac1642fe2dd2.manifest

File version

Not applicable

File size

2,486

Date (UTC)

16-Dec-2011

Time (UTC)

09:15

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