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Article ID: 2028484 - Last Review: October 13, 2010 - Revision: 1.0

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SYMPTOMS

Consider the following scenario:
  • You have a computer that is running Windows Server 2008 or Windows Vista.
  • You use Kerberos authentication to connect to lots of remote computers at the same time.
In this scenario, you experience the following issues on the computer:
  • Unexpectedly high CPU usage in the Lsass.exe process
  • Poor Kerberos authentication performance

CAUSE

These issues occur because the Kerberos client unnecessarily performs a time-consuming computation at the pre-authentication stage. When there are many concurrent remote connections, you experience high CPU usage in the Lsass.exe process.

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=support (http://support.microsoft.com/contactus/?ws=support)
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.

Prerequisites

To apply this hotfix, your computer must be running Windows Server 2008 Service Pack 2 (SP2) or Windows Vista Service Pack 2 (SP2).

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  (http://support.microsoft.com/kb/968849/ ) How to obtain the latest service pack for Windows Server 2008
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  (http://support.microsoft.com/kb/935791/ ) How to obtain the latest Windows Vista service pack

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 English (United States) 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 2008 and Windows Vista 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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.0.600 2 . 22xxxWindows Server 2008 and Windows VistaSP2LDR
  • 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 and for Windows Vista" section. MUM files and MANIFEST files, 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 x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Kerberos.dll6.0.6002.22469500,73618-Aug-201016:57x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Kerberos.dll6.0.6002.22469658,94418-Aug-201017:27x64
Kerberos.dll6.0.6002.22469500,73618-Aug-201016:57x86
For all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Kerberos.dll6.0.6002.224691,396,22418-Aug-201016:47IA-64
Kerberos.dll6.0.6002.22469500,73618-Aug-201016:57x86

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  (http://support.microsoft.com/kb/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
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot Applicable
File size3,078
Date (UTC)18-Aug-2010
Time (UTC)22:25
PlatformNot Applicable
File nameX86_2400bd15a0c7cc1265c1a12d79a1aae4_31bf3856ad364e35_6.0.6002.22469_none_42aa73f999a6eb94.manifest
File versionNot Applicable
File size705
Date (UTC)18-Aug-2010
Time (UTC)22:25
PlatformNot Applicable
File nameX86_microsoft-windows-security-kerberos_31bf3856ad364e35_6.0.6002.22469_none_e90f1a54c739ff85.manifest
File versionNot Applicable
File size38,326
Date (UTC)18-Aug-2010
Time (UTC)17:17
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
Collapse this tableExpand this table
File nameAmd64_a7b703961524228be0f316a61f39751a_31bf3856ad364e35_6.0.6002.22469_none_fe7c74d5446cd1ec.manifest
File versionNot Applicable
File size1,060
Date (UTC)18-Aug-2010
Time (UTC)22:25
PlatformNot Applicable
File nameAmd64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.0.6002.22469_none_452db5d87f9770bb.manifest
File versionNot Applicable
File size38,362
Date (UTC)18-Aug-2010
Time (UTC)17:50
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size3,102
Date (UTC)18-Aug-2010
Time (UTC)22:25
PlatformNot Applicable
File nameWow64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.0.6002.22469_none_4f82602ab3f832b6.manifest
File versionNot Applicable
File size38,939
Date (UTC)18-Aug-2010
Time (UTC)17:04
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameIa64_1f2e952b6da913faccf6aca2c92b591d_31bf3856ad364e35_6.0.6002.22469_none_0227cb5ce21dbef3.manifest
File versionNot Applicable
File size1,058
Date (UTC)18-Aug-2010
Time (UTC)22:25
PlatformNot Applicable
File nameIa64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.0.6002.22469_none_e910be4ac7380881.manifest
File versionNot Applicable
File size38,344
Date (UTC)18-Aug-2010
Time (UTC)17:06
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size2,255
Date (UTC)18-Aug-2010
Time (UTC)22:25
PlatformNot Applicable
File nameWow64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.0.6002.22469_none_4f82602ab3f832b6.manifest
File versionNot Applicable
File size38,939
Date (UTC)18-Aug-2010
Time (UTC)17:04
PlatformNot Applicable

APPLIES TO
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows Server 2008 Datacenter
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Standard without Hyper-V
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise
  • Windows Vista Ultimate
  • Windows Vista Business
Keywords: 
kbqfe kbsurveynew kbexpertiseadvanced kbautohotfix kbhotfixserver KB2028484
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