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Symptoms

On a computer that is running windows 7 or Windows Server 2008 R2, you connect a Microsoft Outlook client to an Exchange Server in a server farm through an RPC-over-HTTP connection. When the servers in the server farm are unavailable intermittently (for example, the servers are restarted), you may experience connectivity issues.

Note This issue occurs when a static mapping from user name to session ID is used.

Cause

This issue occurs because of a race condition when all the servers are started at the same time. The RPC Proxy Server does not work when arbitration results conflict.

When some server farm members do not respond, servers that are outside the relevant array may detect an RPC-over-HTTP session. These additional servers usually have their own understanding of which server owns the session. Therefore, when the RPC-over-HTTP session is set back to the relevant array, arbitration for that session fails.

Note This is the case in all deployments in which Network Load Balancing is set to no affinity.

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 that is 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 exist, 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 with Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 with Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 service pack 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 7 and Windows Server 2008 R2 file information notes


  • 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

    6.1.760
    0.16xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    0.20xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.17xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, very important issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • 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 very important to maintaining 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

Rpchttp.dll

6.1.7600.20975

140,800

28-May-2011

04:41

x86

Rpchttp.dll

6.1.7601.21735

140,800

28-May-2011

05:57

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

Rpchttp.dll

6.1.7600.20975

189,440

28-May-2011

05:27

x64

Rpchttp.dll

6.1.7601.21735

189,440

28-May-2011

05:18

x64

Lbservice.dll

6.1.7600.20975

25,088

28-May-2011

05:25

x64

Rpcproxy.dll

6.1.7600.16385

58,368

14-Jul-2009

01:41

x64

Rpcproxymigrationplugin.dll

6.1.7600.16385

44,544

14-Jul-2009

01:41

x64

Lbservice.dll

6.1.7601.21735

25,088

28-May-2011

05:18

x64

Rpcproxy.dll

6.1.7601.17514

58,368

20-Nov-2010

13:27

x64

Rpcproxymigrationplugin.dll

6.1.7601.17514

44,544

20-Nov-2010

13:27

x64

Rpchttp.dll

6.1.7600.20975

140,800

28-May-2011

04:41

x86

Rpchttp.dll

6.1.7601.21735

140,800

28-May-2011

05:57

x86

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

File name

File version

File size

Date

Time

Platform

Rpchttp.dll

6.1.7600.20975

400,896

28-May-2011

04:21

IA-64

Rpchttp.dll

6.1.7601.21735

400,896

28-May-2011

04:08

IA-64

Lbservice.dll

6.1.7600.20975

45,568

28-May-2011

04:19

IA-64

Rpcproxy.dll

6.1.7600.16385

120,320

14-Jul-2009

01:48

IA-64

Rpcproxymigrationplugin.dll

6.1.7600.16385

107,520

14-Jul-2009

01:48

IA-64

Lbservice.dll

6.1.7601.21735

45,568

28-May-2011

04:08

IA-64

Rpcproxy.dll

6.1.7601.17514

120,320

20-Nov-2010

10:28

IA-64

Rpcproxymigrationplugin.dll

6.1.7601.17514

107,520

20-Nov-2010

10:28

IA-64

Rpchttp.dll

6.1.7600.20975

140,800

28-May-2011

04:41

x86

Rpchttp.dll

6.1.7601.21735

140,800

28-May-2011

05:57

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 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

Update.mum

File version

Not applicable

File size

14,018

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_0a086e6cb0449a40dbce2a0cd32e9356_31bf3856ad364e35_6.1.7600.20975_none_9f52ca693f70baec.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_2b5d4fb41514ca5d0d59cc4425d5c5a6_31bf3856ad364e35_6.1.7600.20975_none_1a08e05baa4cdf76.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_2b9db602ee9b3ed6462ceefbf4373d08_31bf3856ad364e35_6.1.7600.20975_none_fb37adaf64a33486.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_36135b8cd2e99c625bc7439ce7067a96_31bf3856ad364e35_6.1.7600.20975_none_63e84fa4dcda41de.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_40f59caade100a74e1b5d71286240c70_31bf3856ad364e35_6.1.7600.20975_none_b0d3a24cebfcf2ae.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_4e135a03b9050e136424b4e0214dab1f_31bf3856ad364e35_6.1.7600.20975_none_7f4bad9989ab7603.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_4fd0bd4783d50aae757f3845a085eea3_31bf3856ad364e35_6.1.7600.20975_none_b3bfc14adc0caf4f.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_5717bc53e8f4922d79d0761b61165340_31bf3856ad364e35_6.1.7600.20975_none_57810baa3fdcd815.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_6b0254b55890355dd39e6c15e31213bb_31bf3856ad364e35_6.1.7600.20975_none_91d0d633bc3200bc.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_7abdf66f0bda06d4bdcc586a4df3422f_31bf3856ad364e35_6.1.7601.21735_none_63ef59defac97d74.manifest

File version

Not applicable

File size

696

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_7dbcac483d4d0720ab72236c7c9a6cbe_31bf3856ad364e35_6.1.7600.20975_none_f073aef26d82419a.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_7ffb91f0c725211963971a9ef2c39025_31bf3856ad364e35_6.1.7600.20975_none_4a7b0e6bfbc66686.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_9ea2746950e5e4c6cc7a9dbb7247b852_31bf3856ad364e35_6.1.7600.20975_none_aee32e7f582f5f78.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_a25a84953c50a5c3e328c9be009554fa_31bf3856ad364e35_6.1.7600.20975_none_c9a14fae35a9d747.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_a53eefd0de1e758ded833c919aa0e753_31bf3856ad364e35_6.1.7600.20975_none_8a47f92c5737d28b.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_a85b1d668bcc5c0a9157af0a88bfa0d6_31bf3856ad364e35_6.1.7600.20975_none_8a004b5a93923f9d.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_ade0e4b0eaa94c6750861a3d8e0c7040_31bf3856ad364e35_6.1.7600.20975_none_45e773928057bdb8.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_b8f73044b7b079a70d3814a560ff3e9a_31bf3856ad364e35_6.1.7600.20975_none_cd5ea7e2eb470f91.manifest

File version

Not applicable

File size

696

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_bd7e8bf415a5b3b68ca283423f12efb7_31bf3856ad364e35_6.1.7600.20975_none_5bdc8157c3f0d084.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_be92919e46a5c32e04367f01fefcf66c_31bf3856ad364e35_6.1.7600.20975_none_7545d8a28fe4febf.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_d941bf0d2908380cee5891a85da78287_31bf3856ad364e35_6.1.7600.20975_none_3a076b1b55e77c8f.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_d9b3dac78daaab71ae1116d7df6ee213_31bf3856ad364e35_6.1.7600.20975_none_7e1adf0ff09dbf4c.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_ed1b5673b94784235d80d365796f495e_31bf3856ad364e35_6.1.7600.20975_none_66c94086a633f26a.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_f77a37cc03c2000ebae7ef0f8c8fad04_31bf3856ad364e35_6.1.7600.20975_none_bf7331a4574dc000.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_fd1b33207635f8b964685289754bc160_31bf3856ad364e35_6.1.7600.20975_none_1d8da0ab2b0ef161.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_fefaff4fac7e6c10fa0ae83625dfcc06_31bf3856ad364e35_6.1.7600.20975_none_2c9e014270238a37.manifest

File version

Not applicable

File size

704

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

X86_microsoft-windows-rpc-http_31bf3856ad364e35_6.1.7600.20975_none_a063b948b9bcf4bb.manifest

File version

Not applicable

File size

8,684

Date (UTC)

28-May-2011

Time (UTC)

05:12

Platform

Not applicable

File name

X86_microsoft-windows-rpc-http_31bf3856ad364e35_6.1.7601.21735_none_a27555feb6c2f0e3.manifest

File version

Not applicable

File size

8,684

Date (UTC)

28-May-2011

Time (UTC)

06:24

Platform

Not applicable

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

File name

Amd64_037675a24f8146bc7e3ba0f86b7e2d37_31bf3856ad364e35_6.1.7600.20975_none_ee16c756b5d1f283.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_0b920f0ff9611a27a0ad809ff7746a79_31bf3856ad364e35_6.1.7601.21735_none_a04ee67ca7667dd8.manifest

File version

Not applicable

File size

700

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_0bcdf9a828fa1b0003690007ae31df63_31bf3856ad364e35_6.1.7600.20975_none_fd2b1851a85f4f8b.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_13d44297ddaf5b491fbb03d253addccb_31bf3856ad364e35_6.1.7600.20975_none_8ea9821e0fc124be.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_1ec09cd91dc78de609b961fe52dfd274_31bf3856ad364e35_6.1.7600.20975_none_2d1828366c201f08.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_205bdc072207b0889162df2e40a492fa_31bf3856ad364e35_6.1.7600.20975_none_6d038450cfa4a5f6.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_227769534a474bb8439d30f353bd5161_31bf3856ad364e35_6.1.7600.20975_none_a6c1ea4d0e9f0b6a.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_2afcfef7e50461afe4d5e8776349bc5d_31bf3856ad364e35_6.1.7600.20975_none_75706dbbeea1300f.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_33a33678a39f745653621074409e5140_31bf3856ad364e35_6.1.7600.20975_none_6cd22a45b3d90049.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_4191521efc3fa37ea0ce05cf25320a8b_31bf3856ad364e35_6.1.7600.20975_none_9bc57aa3579fdc1a.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_561d3b4addb10f6b07b5d40e61b51a77_31bf3856ad364e35_6.1.7600.20975_none_44189c3acdbcc88e.manifest

File version

Not applicable

File size

706

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_651d0c7306a71e383c462593ecd85e68_31bf3856ad364e35_6.1.7600.20975_none_2bdb7490b1bd2e0b.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_6bb6600f11ace7975b75385d5fc40a21_31bf3856ad364e35_6.1.7600.20975_none_86d0856c23d82a13.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_6dbb81ed7266bed9553f52ea6b440371_31bf3856ad364e35_6.1.7600.20975_none_95a0b83a13fce2c4.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_7abdf66f0bda06d4bdcc586a4df3422f_31bf3856ad364e35_6.1.7601.21735_none_c00df562b326eeaa.manifest

File version

Not applicable

File size

698

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_86aade7bc7aa10c68d3537e5087b1dce_31bf3856ad364e35_6.1.7600.20975_none_77a7086c45f0d882.manifest

File version

Not applicable

File size

700

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_88cdaf7cb46b3ce930e341f5856da881_31bf3856ad364e35_6.1.7600.20975_none_d152f80ea264ec5a.manifest

File version

Not applicable

File size

1,040

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_8c2c2823f1c85edf65bec783499b4067_31bf3856ad364e35_6.1.7600.20975_none_1164f051a00d7167.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_900deda24b32dc629345f540daa35bba_31bf3856ad364e35_6.1.7600.20975_none_b0bcc2b741bcaa06.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_b726596c936d390ab437e92899036ade_31bf3856ad364e35_6.1.7600.20975_none_687c8cfa2ae18922.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_b813220d2624c23736314a4737084fe7_31bf3856ad364e35_6.1.7600.20975_none_5ae31ba4525520d6.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_b8f73044b7b079a70d3814a560ff3e9a_31bf3856ad364e35_6.1.7600.20975_none_297d4366a3a480c7.manifest

File version

Not applicable

File size

698

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_b9fcdc64da19ebe56dec357f036b3397_31bf3856ad364e35_6.1.7601.21735_none_b77d9613c54740fb.manifest

File version

Not applicable

File size

1,040

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_c2f9d56a0f28f34fbdaaf77fa7fc9af1_31bf3856ad364e35_6.1.7600.20975_none_e469d43852539221.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

Amd64_ce6ffababe7c93d5c9f62d40d01b626a_31bf3856ad364e35_6.1.7600.20975_none_d8e1b5f46dbfae5c.manifest

File version

Not applicable

File size

1,056

Date (UTC)

31-May-2011

Time (UTC)

17:23

Platform

Not applicable

File name

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

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31-May-2011

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17:23

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31-May-2011

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17:23

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07:00

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8,684

Date (UTC)

28-May-2011

Time (UTC)

06:24

Platform

Not applicable

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