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Symptoms

Consider the following scenario:

  • You have a computer that is running Windows 7 or Windows Server 2008 R2.

  • An application or service calls the LogonUser function, passes credentials, and impersonates the user context.

  • The application or service calls the AcquireCredentialshandle function, passes a SEC_WINNT_AUTH_IDENTITY structure. The credential fields of the structure has a NULL value.

  • The application or service calls the InitializeSecurityContext function to create a security context with a peer by using the credential handle and by specifying the Negotiate security package.

  • Kerberos authentication fails in the InitializeSecurityContext function and has the STATUS_NO_LOGON_SERVERS status.

In this scenario, the InitializeSecurityContext function does not fall back to NTLM authentication and returns the STATUS_DOWNGRADE_DETECTED status.

Cause

This issue occurs because the AcquireCredentialsHandle function does not mark the credentials as being suitable for fallback operation if the credential fields of a SEC_WINNT_AUTH_IDENTITY structure has a NULL value. Kerberos fails and has the STATUS_NO_LOGON_SERVERS status. Therefore, the InitializeSecurityContext function does not allow a fallback operation to NTLM authentication.

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 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 Web site:

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 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 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


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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    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

  • 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 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

Cng.sys

6.1.7600.16385

369,568

14-Jul-2009

01:17

x86

Ksecdd.sys

6.1.7600.20926

67,456

17-Mar-2011

06:57

x86

Ksecpkg.sys

6.1.7600.20926

133,504

17-Mar-2011

06:57

x86

Lsasrv.dll

6.1.7600.20926

1,037,824

17-Mar-2011

06:50

x86

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

21:33

Not applicable

Lsass.exe

6.1.7600.16385

22,528

14-Jul-2009

01:14

x86

Secur32.dll

6.1.7600.20926

22,016

17-Mar-2011

06:51

x86

Sspicli.dll

6.1.7600.20926

100,352

17-Mar-2011

06:51

x86

Sspisrv.dll

6.1.7600.20926

15,360

17-Mar-2011

06:51

x86

Cng.sys

6.1.7600.16385

369,568

14-Jul-2009

01:17

x86

Ksecdd.sys

6.1.7601.17514

67,456

20-Nov-2010

12:30

x86

Ksecpkg.sys

6.1.7601.21685

133,504

17-Mar-2011

06:57

x86

Lsasrv.dll

6.1.7601.21685

1,038,848

17-Mar-2011

06:51

x86

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

21:33

Not applicable

Lsass.exe

6.1.7601.21685

22,528

17-Mar-2011

06:49

x86

Secur32.dll

6.1.7601.17514

22,016

20-Nov-2010

12:21

x86

Sspicli.dll

6.1.7601.17514

100,352

20-Nov-2010

12:21

x86

Sspisrv.dll

6.1.7601.17514

15,872

20-Nov-2010

12:21

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

Cng.sys

6.1.7600.16385

460,504

14-Jul-2009

01:43

x64

Ksecdd.sys

6.1.7600.20926

95,616

17-Mar-2011

05:19

x64

Ksecpkg.sys

6.1.7600.20926

152,960

17-Mar-2011

05:19

x64

Lsasrv.dll

6.1.7600.20926

1,446,400

17-Mar-2011

05:14

x64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

20:52

Not applicable

Lsass.exe

6.1.7600.16385

31,232

14-Jul-2009

01:39

x64

Secur32.dll

6.1.7600.20926

28,160

17-Mar-2011

05:17

x64

Sspicli.dll

6.1.7600.20926

136,192

17-Mar-2011

05:17

x64

Sspisrv.dll

6.1.7600.20926

28,672

17-Mar-2011

05:17

x64

Cng.sys

6.1.7601.17514

459,248

20-Nov-2010

13:28

x64

Ksecdd.sys

6.1.7601.17514

95,616

20-Nov-2010

13:33

x64

Ksecpkg.sys

6.1.7601.21685

152,960

17-Mar-2011

05:06

x64

Lsasrv.dll

6.1.7601.21685

1,446,912

17-Mar-2011

05:03

x64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

20:52

Not applicable

Lsass.exe

6.1.7601.21685

31,232

17-Mar-2011

05:00

x64

Secur32.dll

6.1.7601.17514

28,160

20-Nov-2010

13:27

x64

Sspicli.dll

6.1.7601.17514

136,192

20-Nov-2010

13:27

x64

Sspisrv.dll

6.1.7601.17514

29,184

20-Nov-2010

13:27

x64

Lsasrv.mof

Not applicable

13,780

22-Jul-2009

23:19

Not applicable

Secur32.dll

6.1.7600.20926

22,016

17-Mar-2011

06:51

x86

Sspicli.dll

6.1.7600.20926

96,768

17-Mar-2011

06:48

x86

Lsasrv.mof

Not applicable

13,780

12-Nov-2010

23:53

Not applicable

Secur32.dll

6.1.7601.21685

22,016

17-Mar-2011

06:51

x86

Sspicli.dll

6.1.7601.21685

96,768

17-Mar-2011

06:48

x86

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

File name

File version

File size

Date

Time

Platform

Cng.sys

6.1.7600.16385

787,736

14-Jul-2009

01:52

IA-64

Ksecdd.sys

6.1.7600.20926

179,584

17-Mar-2011

04:15

IA-64

Ksecpkg.sys

6.1.7600.20926

307,072

17-Mar-2011

04:15

IA-64

Lsasrv.dll

6.1.7600.20926

2,654,720

17-Mar-2011

04:09

IA-64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

20:57

Not applicable

Lsass.exe

6.1.7600.16385

56,320

14-Jul-2009

01:44

IA-64

Secur32.dll

6.1.7600.20926

48,640

17-Mar-2011

04:11

IA-64

Sspicli.dll

6.1.7600.20926

275,456

17-Mar-2011

04:12

IA-64

Sspisrv.dll

6.1.7600.20926

45,568

17-Mar-2011

04:12

IA-64

Cng.sys

6.1.7600.16385

787,736

14-Jul-2009

01:52

IA-64

Ksecdd.sys

6.1.7601.17514

179,584

20-Nov-2010

10:33

IA-64

Ksecpkg.sys

6.1.7601.21685

307,072

17-Mar-2011

04:08

IA-64

Lsasrv.dll

6.1.7601.21685

2,655,744

17-Mar-2011

04:02

IA-64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

20:57

Not applicable

Lsass.exe

6.1.7600.16385

56,320

14-Jul-2009

01:44

IA-64

Secur32.dll

6.1.7601.17514

48,640

20-Nov-2010

10:28

IA-64

Sspicli.dll

6.1.7601.17514

275,456

20-Nov-2010

10:28

IA-64

Sspisrv.dll

6.1.7601.17514

46,080

20-Nov-2010

10:28

IA-64

Lsasrv.mof

Not applicable

13,780

22-Jul-2009

23:19

Not applicable

Secur32.dll

6.1.7600.20926

22,016

17-Mar-2011

06:51

x86

Sspicli.dll

6.1.7600.20926

96,768

17-Mar-2011

06:48

x86

Lsasrv.mof

Not applicable

13,780

12-Nov-2010

23:53

Not applicable

Secur32.dll

6.1.7601.21685

22,016

17-Mar-2011

06:51

x86

Sspicli.dll

6.1.7601.21685

96,768

17-Mar-2011

06:48

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

For more information about the InitializeSecurityContext function, visit the following MSDN website:

General information about the InitializeSecurityContext functionFor more information about the AcquireCredentialsHandle function, visit the following MSDN website:

General information about the AcquireCredentialsHandle functionFor more information about the LogonUser function, visit the following MSDN website:

General information about the LogonUser function

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

2,773

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

X86_5676ba3d4d37c9101f9a0b3dd65ac1f4_31bf3856ad364e35_6.1.7600.20926_none_7415dd3c60acef57.manifest

File version

Not applicable

File size

691

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

X86_a9ab587f9f300cffcfff342e55fae6cd_31bf3856ad364e35_6.1.7601.21685_none_d7f6a288493ac880.manifest

File version

Not applicable

File size

691

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

X86_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20926_none_a6ec6700d70ad0e5.manifest

File version

Not applicable

File size

103,660

Date (UTC)

17-Mar-2011

Time (UTC)

20:08

Platform

Not applicable

File name

X86_microsoft-windows-lsa_31bf3856ad364e35_6.1.7601.21685_none_a890e24ed462cdf9.manifest

File version

Not applicable

File size

103,660

Date (UTC)

17-Mar-2011

Time (UTC)

20:08

Platform

Not applicable

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

File name

Amd64_28c44e2c0bb0a285328fef4ff2fea2d7_31bf3856ad364e35_6.1.7600.20926_none_85912d689394adf0.manifest

File version

Not applicable

File size

695

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Amd64_299914ea63b5fc4fd31dd26463f59f06_31bf3856ad364e35_6.1.7601.21685_none_73d25e1f96021374.manifest

File version

Not applicable

File size

695

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Amd64_561edc06d3669bc7254c2a270730f77e_31bf3856ad364e35_6.1.7601.21685_none_cebec1086ea706af.manifest

File version

Not applicable

File size

1,032

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Amd64_8fb5a66833bac4e2df6bbaabd71984e8_31bf3856ad364e35_6.1.7600.20926_none_f758b54e39e6f653.manifest

File version

Not applicable

File size

1,032

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Amd64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20926_none_030b02848f68421b.manifest

File version

Not applicable

File size

103,664

Date (UTC)

17-Mar-2011

Time (UTC)

20:11

Platform

Not applicable

File name

Amd64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7601.21685_none_04af7dd28cc03f2f.manifest

File version

Not applicable

File size

103,664

Date (UTC)

17-Mar-2011

Time (UTC)

20:11

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,215

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20926_none_0d5facd6c3c90416.manifest

File version

Not applicable

File size

86,382

Date (UTC)

17-Mar-2011

Time (UTC)

07:11

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7601.21685_none_0f042824c121012a.manifest

File version

Not applicable

File size

86,382

Date (UTC)

17-Mar-2011

Time (UTC)

07:11

Platform

Not applicable

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

File name

Ia64_a336c82657b2aa0749c17b8862256557_31bf3856ad364e35_6.1.7601.21685_none_c64be00ffb5bbd9d.manifest

File version

Not applicable

File size

1,030

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Ia64_d0946eee0be3d2c3668a96b094f00fcc_31bf3856ad364e35_6.1.7600.20926_none_8c7d54fb378b3887.manifest

File version

Not applicable

File size

1,030

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Ia64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20926_none_a6ee0af6d708d9e1.manifest

File version

Not applicable

File size

103,662

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Ia64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7601.21685_none_a8928644d460d6f5.manifest

File version

Not applicable

File size

103,662

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,168

Date (UTC)

17-Mar-2011

Time (UTC)

20:05

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20926_none_0d5facd6c3c90416.manifest

File version

Not applicable

File size

86,382

Date (UTC)

17-Mar-2011

Time (UTC)

07:11

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7601.21685_none_0f042824c121012a.manifest

File version

Not applicable

File size

86,382

Date (UTC)

17-Mar-2011

Time (UTC)

07:11

Platform

Not applicable

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