Symptoms
Consider the following scenario:
-
A Massachusetts Institute of Technology (MIT) Kerberos client performs Kerberos authentication against a Windows Server 2008-based domain controller.
-
KTPass was used to create a keytab file to be used on the MIT Kerberos client.
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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_UNKNOWNThis 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.
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, 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.
Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.
Prerequisites
This hotfix cannot be installed on the computer unless the Active Directory Domain Services (AD DS) role is installed. If this role is not installed on the computer, the hotfix cannot be successfully installed, and the following error is returned:
The update does not apply to your system
For more information about how to add the AD DS role, visit the following Microsoft Web site:
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 |
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
