Update that improves AD FS proxy and STS reliability in Windows Server 2012 R2 when multiple clients sign in

Attiecas uz: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 EssentialsWindows Server 2012 R2 Foundation

This article describes an issue when the AD FS proxy and the STS performance is slow in Windows Server 2012 R2. The issue is resolved in update rollup 2955164 for Windows 8.1 or Windows Server 2012 R2 , or in hotfix 2948086 that is described in this article and has a prerequisite.


Assume that you have a Security Token Service (STS) installed on a Windows Server 2012 R2-based computer. When multiple clients (over 200 clients) try to sign in by using an Active Directory Federation Services (AD FS) proxy, the AD FS proxy consumes 100% usage of the CPU. In this situation, the AD FS proxy performance is slow, and causes a delay that exceeds 10seconds. This also causes STS to work under minimal load. Therefore, STS rejects the requests or serves only 5 to 10 requests per second.


This issue occurs because the additional "stale" requests are added to the request pool when multiple clients try to sign in. Therefore, the resource usage on AD FS is exhausted.


To resolve this issue, install update rollup 2955164, or install the hotfix that is described in this article.

Update information

For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2955164 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: May 2014

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 this specific problem.

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, submit a request to 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.


To apply this hotfix, you must first install the update 2919355 on Windows Server 2012 R2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014

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.


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 Server 2012 R2

Additional files for all supported x64-based versions of Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Amd64_03cfbefca73029d138ffc41368082aec_31bf3856ad364e35_6.3.9600.17078_none_6569a0996a61143a.manifestNot applicable70524-Mar-201408:38Not applicable
Amd64_2887fe971ca12c81323e06a74ed1e681_31bf3856ad364e35_6.3.9600.17078_none_de45fcac62d82685.manifestNot applicable71024-Mar-201408:38Not applicable
Amd64_4a8bcd413fe657e849edd2a87ca7ea7d_31bf3856ad364e35_6.3.9600.17078_none_095bb28d6143171e.manifestNot applicable71024-Mar-201408:38Not applicable
Amd64_5da4f602fdd0dd65e6b2f9b9e20417ce_31bf3856ad364e35_6.3.9600.17078_none_97d109eea2558f8b.manifestNot applicable70524-Mar-201408:38Not applicable
Msil_microsoft.identityserver.claimspolicy_31bf3856ad364e35_6.3.9600.17078_none_e085b59943be06ab.manifestNot applicable3,35122-Mar-201423:25Not applicable
Msil_microsoft.identityserver.proxyservice_31bf3856ad364e35_6.3.9600.17078_none_46ef0f1be92fcd11.manifestNot applicable4,76422-Mar-201423:25Not applicable
Msil_microsoft.identityserver.service_31bf3856ad364e35_6.3.9600.17078_none_5d0a3c99001a2c2f.manifestNot applicable3,33122-Mar-201423:25Not applicable
Msil_microsoft.identityserver.webhost_31bf3856ad364e35_6.3.9600.17078_none_7927aec3e186419e.manifestNot applicable3,33122-Mar-201423:25Not applicable