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Symptoms

When a Windows Server 2008 R2-based or Windows 7-based computer runs under a high Kerberos authentication load, the Lsass.exe process crashes and error code 255 is generated. Therefore, the computer restarts unexpectedly. Additionally, the following events are logged in the System log:

Cause

This issue occurs because a race condition occurs when the computer receives multiple authentication requests.

Resolution

Hotfix information

Important This hotfix has been re-released to address an issue in which the digital signature on files produced and signed by Microsoft will expire prematurely, as described in Microsoft Security Advisory 2749655.

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 Server 2008 R2 Service Pack 1 (SP1) or Windows 7 SP1.For more information about how to obtain a Windows Server 2008 R2 or Windows 7 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 apply this hotfix, you do not have to change 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 Server 2008 R2 and Windows 7 file information notes

Important Windows 7 hotfixes and Windows Server 2008 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 7/Windows Server 2008 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

    6.1.760
    1.22xxx

    Windows Server 2008 R2

    SP1

    LDR

  • The MANIFEST files (.manifest) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" 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 7

File name

File version

File size

Date

Time

Platform

Kerberos.dll

6.1.7601.22048

542,720

10-Jul-2012

16:55

x86

For all supported x64-based versions of Windows Server 2008 R2 and of Windows 7

File name

File version

File size

Date

Time

Platform

Kerberos.dll

6.1.7601.22048

716,800

10-Jul-2012

17:51

x64

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

File name

File version

File size

Date

Time

Platform

Kerberos.dll

6.1.7601.22048

1,500,672

10-Jul-2012

16:43

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 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 2008 R2 and for Windows 7

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not Applicable

File size

2,136

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

X86_e89997725ac7b2b809f9cd2f0db35c2f_31bf3856ad364e35_6.1.7601.22048_none_59c28e6cde2aa378.manifest

File version

Not Applicable

File size

705

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

X86_microsoft-windows-security-kerberos_31bf3856ad364e35_6.1.7601.22048_none_e94b531a28422cb3.manifest

File version

Not Applicable

File size

33,218

Date (UTC)

10-Jul-2012

Time (UTC)

17:27

Platform

Not Applicable

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

File name

Amd64_b37577e6e6c177b1eef0674f18946507_31bf3856ad364e35_6.1.7601.22048_none_8df1c0dae1285c63.manifest

File version

Not Applicable

File size

709

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

Amd64_f3bb341a95c17d260ec24d7dfabc84ea_31bf3856ad364e35_6.1.7601.22048_none_269068616a017eac.manifest

File version

Not Applicable

File size

1,060

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

Amd64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.1.7601.22048_none_4569ee9de09f9de9.manifest

File version

Not Applicable

File size

33,222

Date (UTC)

10-Jul-2012

Time (UTC)

18:25

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,350

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

Wow64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.1.7601.22048_none_4fbe98f015005fe4.manifest

File version

Not Applicable

File size

22,967

Date (UTC)

10-Jul-2012

Time (UTC)

17:13

Platform

Not Applicable

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

File name

Ia64_16d87004eeab8bac6aeca5b373981049_31bf3856ad364e35_6.1.7601.22048_none_7175c8dee6ba84d6.manifest

File version

Not Applicable

File size

1,058

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

Ia64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.1.7601.22048_none_e94cf710284035af.manifest

File version

Not Applicable

File size

33,220

Date (UTC)

10-Jul-2012

Time (UTC)

18:22

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,447

Date (UTC)

17-Sep-2012

Time (UTC)

08:25

Platform

Not Applicable

File name

Wow64_microsoft-windows-security-kerberos_31bf3856ad364e35_6.1.7601.22048_none_4fbe98f015005fe4.manifest

File version

Not Applicable

File size

22,967

Date (UTC)

10-Jul-2012

Time (UTC)

17:13

Platform

Not Applicable

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