An error code is returned when a Kerberos client requests a TGT against a Windows Server 2008-based domain controller: KERB5KDC_ERR_C_PRINICPAL_UNKNOWN

An error code is returned when a Kerberos client requests a TGT against a Windows Server 2008-based domain controller: KERB5KDC_ERR_C_PRINICPAL_UNKNOWN

Article ID : 951191
Last Review : May 16, 2008
Revision : 2.0
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SYMPTOMS

Consider the following scenario:

• A client performs Kerberos authentication against a Windows Server 2008-based domain controller.
• The client requests a ticket-granting ticket (TGT) by specifying the host principal name as the client name in the KRB_AS_REQ packet.

In this scenario, authentication fails, and the following error code is returned:

KERB5KDC_ERR_C_PRINICPAL_UNKNOWN

This problem may occur when a third-party implementation of a Kerberos client interoperates with a Windows Server 2008-based domain controller. For example, this problem may occur if a principal name in the service/user@realm.com format is used to generate a keytab file.

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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. 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, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451 (http://go.microsoft.com/?linkid=6294451)

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. To create a separate service request, visit the following Microsoft Web site:

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

Note The Hotfix download available section and the online request forms display 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 installing 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 English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Server 2008, x86-based versions
File name File version File size Date Time Platform
Kdcsvc.dll 6.0.6001.22162 311,296 18-Apr-2008 05:30 x86
Kdcsvc.mof Not applicable 5,300 18-Dec-2007 21:27 Not applicable
Windows Server 2008, x64-based versions
File name File version File size Date Time Platform
Kdcsvc.dll 6.0.6001.22162 404,480 18-Apr-2008 06:40 x64
Kdcsvc.mof Not applicable 5,300 18-Dec-2007 21:27 Not applicable

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the Applies to section.

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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

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APPLIES TO
• Windows Server 2008 Standard
• Windows Server 2008 Enterprise
• Windows Server 2008 Datacenter
• Windows Server 2008 Standard without Hyper-V
• Windows Server 2008 Enterprise without Hyper-V
• Windows Server 2008 Datacenter without Hyper-V

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Keywords: 
kbexpertiseadvanced kbexpertiseinter kbautohotfix kbbug kbfix kbhotfixserver kbqfe KB951191

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Microsoft Knowledge Base Article

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