A certificate mapping rule in IIS does not work for a client certificate that has Unicode encoding attributes in Windows Server 2008, Windows Vista, Windows Server 2008 R2, or Windows 7

Applies to: Windows Server 2008 R2 Service Pack 1Windows Server 2008 R2 EnterpriseWindows Server 2008 R2 Datacenter More

Symptoms


Consider the following scenario:
  • You install Internet Information Services (IIS) on a computer that is running Windows Server 2008, Windows Vista, Windows 7, or Windows Server 2008 R2. 
  • You install the IIS Client Certificate Mapping module on the computer.
  • You configure the client certificate mappings and create certificate mapping rules on the computer.

    Note You can use client certificates in this manner for user authentication purposes. For more information about how to do this, see the "More information" section.
  • The client certificate for one user has Unicode encoding attributes. For example, the name of the user contains a UTF-8 string.
In this scenario, the certificate mapping rule does not work for this user.

Cause


This issue occurs because the Authmap.dll file cannot decode the client attribute.

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: 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, you must be running one of the following operating systems:
  • Windows Vista Service Pack 2 (SP2)
  • Windows Server 2008 SP2
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 SP1
For more information about how to obtain a Windows 7 or 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

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 How to obtain the latest Windows Vista service pack

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 How to obtain the latest service pack for Windows Server 2008

Additionally, you must have the IIS Client Certificate Mapping module installed in IIS.

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.

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 a similar issue that occurs in an earlier version of IIS, click the following article number to view the article in the Microsoft Knowledge Base:
828970 Problems Decoding Client Certificate Attributes of Type CERT_RDN_UTF8_STRING
For more information about how to configure Many-to-One client certificate mapping for IIS 7 and IIS 7.5, visit the following Microsoft website: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 Vista and for Windows Server 2008

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Additional file information for Windows 7 and for Windows Server 2008 R2

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