RPC over HTTP connection cannot be set up when you try to access certain services on a computer that is running Windows Vista or Windows Server 2008

Symptoms

Consider the following scenario. You have a computer that is running Windows Vista or Windows Server 2008. You configure the computer to use the RPC over HTTP feature to access certain services. In this scenario, the RPC over HTTP module (Rpchttp.dll) may not work correctly. Therefore, the RPC over HTTP connection does not establish successfully. For example, you cannot sign in to Outlook Anywhere or in to Office Communicator. Additionally, you are prompted to provide your user credentials.

Cause

This issue occurs because the Rpchttp.dll module sends data packages but does not include the authentication packets to the Winhttp interface. Because of this behavior, the Winhttp interface responds by prompting you to provide user credentials. However, the Rpchttp.dll module keeps retrying by using the same date package request, and then times out. Therefore, client authentication fails, and you are prompted to provide your user credentials again.

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 Windows Vista Service Pack 2 (SP2) or Windows Server 2008 Service Pack 2 (SP2).

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

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to 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) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. 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

Rpchttp.dll

6.0.6001.22760

127,488

09-Sep-2010

15:46

x86

Rpchttp.dll

6.0.6002.22484

127,488

09-Sep-2010

17:27

x86

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

File name

File version

File size

Date

Time

Platform

Rpchttp.dll

6.0.6001.22760

164,352

09-Sep-2010

16:16

x64

Rpchttp.dll

6.0.6002.22484

164,352

09-Sep-2010

16:57

x64

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

File name

File version

File size

Date

Time

Platform

Rpchttp.dll

6.0.6001.22760

370,688

09-Sep-2010

15:50

IA-64

Rpchttp.dll

6.0.6002.22484

370,688

09-Sep-2010

17:00

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 the security types that are provided by RPC over HTTP, visit the following Microsoft website:

Introduction to the RPC over HTTP securityFor 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

X86_a9164d83c54c6430b0d7871fde7c7572_31bf3856ad364e35_6.0.6002.22484_none_ae89b2c7d90c6c8e.manifest

File version

Not applicable

File size

696

Date (UTC)

10-Sep-2010

Time (UTC)

05:22

Platform

Not applicable


File name

X86_ea35d7c31d5a9bda2cc52bd5cbd170c9_31bf3856ad364e35_6.0.6001.22760_none_cc7981f1d3fb8132.manifest

File version

Not applicable

File size

696

Date (UTC)

10-Sep-2010

Time (UTC)

05:22

Platform

Not applicable


File name

X86_microsoft-windows-rpc-http_31bf3856ad364e35_6.0.6001.22760_none_a041b59758a22008.manifest

File version

Not applicable

File size

7,338

Date (UTC)

09-Sep-2010

Time (UTC)

16:03

Platform

Not applicable


File name

X86_microsoft-windows-rpc-http_31bf3856ad364e35_6.0.6002.22484_none_a21688cf55d5126a.manifest

File version

Not applicable

File size

7,338

Date (UTC)

09-Sep-2010

Time (UTC)

17:50

Platform

Not applicable

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

File name

Amd64_d2818e2d9fbacf3569608c5e092a7f82_31bf3856ad364e35_6.0.6002.22484_none_e4460d321bdb2ca5.manifest

File version

Not applicable

File size

1,040

Date (UTC)

10-Sep-2010

Time (UTC)

05:22

Platform

Not applicable


File name

Amd64_d86f5b929fa67ef5716703dbbd03adb8_31bf3856ad364e35_6.0.6001.22760_none_4d121ecaf5c58eea.manifest

File version

Not applicable

File size

1,040

Date (UTC)

10-Sep-2010

Time (UTC)

05:22

Platform

Not applicable


File name

Amd64_microsoft-windows-rpc-http_31bf3856ad364e35_6.0.6001.22760_none_fc60511b10ff913e.manifest

File version

Not applicable

File size

7,368

Date (UTC)

09-Sep-2010

Time (UTC)

16:34

Platform

Not applicable


File name

Amd64_microsoft-windows-rpc-http_31bf3856ad364e35_6.0.6002.22484_none_fe3524530e3283a0.manifest

File version

Not applicable

File size

7,368

Date (UTC)

09-Sep-2010

Time (UTC)

17:15

Platform

Not applicable

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

File name

Ia64_4fcda0bfbbc8880861a6aca101c3a326_31bf3856ad364e35_6.0.6001.22760_none_17b2e7b3e8afd92b.manifest

File version

Not applicable

File size

1,038

Date (UTC)

10-Sep-2010

Time (UTC)

05:22

Platform

Not applicable


File name

Ia64_cedde819b3ce2601d786137ccb4a1eb0_31bf3856ad364e35_6.0.6002.22484_none_109fe6ba0e2e43d1.manifest

File version

Not applicable

File size

1,038

Date (UTC)

10-Sep-2010

Time (UTC)

05:22

Platform

Not applicable


File name

Ia64_microsoft-windows-rpc-http_31bf3856ad364e35_6.0.6001.22760_none_a043598d58a02904.manifest

File version

Not applicable

File size

7,351

Date (UTC)

09-Sep-2010

Time (UTC)

16:05

Platform

Not applicable


File name

Ia64_microsoft-windows-rpc-http_31bf3856ad364e35_6.0.6002.22484_none_a2182cc555d31b66.manifest

File version

Not applicable

File size

7,351

Date (UTC)

09-Sep-2010

Time (UTC)

17:16

Platform

Not applicable

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