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.

Symptoms

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.

Cause

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.

Resolution

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:

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 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.

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 Server 2012 R2 file information and notesImportant Windows 8.1 hotfixes and Windows Server 2012 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 8.1/Windows Server 2012 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

    6.3.960 0.17xxx

    Windows Server 2012 R2

    RTM

    GDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very 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 x64-based versions of Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Microsoft.identityserver.claimspolicy.dll

6.3.9600.17078

212,992

22-Mar-2014

21:47

x64

Microsoft.identityserver.proxyservice.exe

6.3.9600.17078

71,680

22-Mar-2014

21:47

x64

Microsoft.identityserver.service.dll

6.3.9600.17078

668,160

22-Mar-2014

21:47

x64

Microsoft.identityserver.webhost.dll

6.3.9600.17078

172,544

22-Mar-2014

21:47

x64


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

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