"LDAP_AUTH_UNKNOWN (0x56)" error code occurs when you call the "ldap_set_option" function in Windows 7 or in Windows Server 2008 R2 if you use the "LDAP_OPT_SASL_METHOD" session option

Symptoms

Consider the following scenario:

  • You call the ldap_set_option function on a computer that is running Windows 7 or Windows Server 2008 R2.

    Note This function is used for setting the Lightweight Directory Access Protocol (LDAP) session settings.

  • You use the LDAP_OPT_SASL_METHOD option in the function.

    Note This option is used to enable the Simple Authentication and Security Layer (SASL) authentication mode.

In this scenario, the function fails together with the following error code:

LDAP_AUTH_UNKNOWN (0x56)

Cause

This issue occurs because the export table for the Secur32.dll module is incorrect.

The Wldap32.dll module loads function pointers from the Secur32.dll module to enable the SASL authentication mode. However, the Secur32.dll module incorrectly exports the American National Standards Institute (ANSI) version of the functions when an Unicode version function is expected. Therefore, the export table is incorrect.

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 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

There are no prerequisites for applying this hotfix.

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 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

6.1.7600.20761

67,456

21-Jul-2010

05:10

x86

Ksecpkg.sys

6.1.7600.20761

133,504

21-Jul-2010

05:10

x86

Lsasrv.dll

6.1.7600.20761

1,037,312

21-Jul-2010

05:04

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

6.1.7600.20761

22,016

21-Jul-2010

05:05

x86

Sspicli.dll

6.1.7600.20761

100,352

21-Jul-2010

05:05

x86

Sspisrv.dll

6.1.7600.20761

15,360

21-Jul-2010

05:05

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

6.1.7600.20761

95,616

21-Jul-2010

05:49

x64

Ksecpkg.sys

6.1.7600.20761

152,960

21-Jul-2010

05:49

x64

Lsasrv.dll

6.1.7600.20761

1,446,912

21-Jul-2010

05:39

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

6.1.7600.20761

28,160

21-Jul-2010

05:41

x64

Sspicli.dll

6.1.7600.20761

136,192

21-Jul-2010

05:42

x64

Sspisrv.dll

6.1.7600.20761

28,672

21-Jul-2010

05:42

x64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

21:33

Not applicable

Secur32.dll

6.1.7600.20761

22,016

21-Jul-2010

05:05

x86

Sspicli.dll

6.1.7600.20761

96,768

21-Jul-2010

05:01

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

6.1.7600.20761

179,584

21-Jul-2010

04:40

IA-64

Ksecpkg.sys

6.1.7600.20761

307,072

21-Jul-2010

04:40

IA-64

Lsasrv.dll

6.1.7600.20761

2,654,720

21-Jul-2010

04:33

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

6.1.7600.20761

48,640

21-Jul-2010

04:35

IA-64

Sspicli.dll

6.1.7600.20761

275,456

21-Jul-2010

04:36

IA-64

Sspisrv.dll

6.1.7600.20761

45,568

21-Jul-2010

04:36

IA-64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

21:33

Not applicable

Secur32.dll

6.1.7600.20761

22,016

21-Jul-2010

05:05

x86

Sspicli.dll

6.1.7600.20761

96,768

21-Jul-2010

05:01

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 the LDAP session options, visit the following Microsoft Developer Network (MSDN) website:

General information about the LDAP session optionsFor 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 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

1,880

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

X86_b744005952fb20612929ba292f85e080_31bf3856ad364e35_6.1.7600.20761_none_1947f43593dfbb3e.manifest

File version

Not applicable

File size

691

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

X86_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20761_none_a6bc2212d72fc7a8.manifest

File version

Not applicable

File size

103,660

Date (UTC)

23-Jul-2010

Time (UTC)

00:36

Platform

Not applicable

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

File name

Amd64_c04a09648ac7889e6afbf6b039529ce3_31bf3856ad364e35_6.1.7600.20761_none_51efc0633a4133d3.manifest

File version

Not applicable

File size

695

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

Amd64_e8309d4074194858c5d97580b7995fac_31bf3856ad364e35_6.1.7600.20761_none_a6b566ae2514eb51.manifest

File version

Not applicable

File size

1,032

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

Amd64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20761_none_02dabd968f8d38de.manifest

File version

Not applicable

File size

103,664

Date (UTC)

23-Jul-2010

Time (UTC)

00:39

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,114

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20761_none_0d2f67e8c3edfad9.manifest

File version

Not applicable

File size

86,382

Date (UTC)

21-Jul-2010

Time (UTC)

05:31

Platform

Not applicable

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

File name

Ia64_f41f0572408e2dd8475ee6f261d924ac_31bf3856ad364e35_6.1.7600.20761_none_fbde69bc582a2fd9.manifest

File version

Not applicable

File size

1,030

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

Ia64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20761_none_a6bdc608d72dd0a4.manifest

File version

Not applicable

File size

103,662

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,690

Date (UTC)

23-Jul-2010

Time (UTC)

00:33

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20761_none_0d2f67e8c3edfad9.manifest

File version

Not applicable

File size

86,382

Date (UTC)

21-Jul-2010

Time (UTC)

05:31

Platform

Not applicable

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