Microsoft KB Archive/833708

= KDC does not allow clients to specify an etype in Windows Server 2003 =

Article ID: 833708

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition

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Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
The Microsoft Windows Server 2003 Key Distribution Center (KDC) uses the strongest encryption type (etype) available to encrypt service tickets. If a client requests etype DES-CBC-CRC, the KDC encrypts tickets with RC4_HMAC_NT. If the client does not understand this etype, the service ticket is unusable.



Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, 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

Note If additional issues occur or 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

Prerequisites
See the &quot;More Information&quot; section in this article.

Restart requirement
You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.   Date         Time   Version       File name   Size     Platform ---  20-Dec-2004  23:26  5.2.3790.242  Kdcsvc.dll  226,816  x86 20-Dec-2004 23:27  5.2.3790.242  Kdcsvc.dll  586,752  IA-64



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.



MORE INFORMATION
By default, the new logic that is introduced in this hotfix is disabled. To enable the new logic, follow these steps.

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.  Click Start, click Run, type regedit in the Open box, and then click OK. Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Kdc

 Right-click Kdc, point to New, and then click DWORD Value. Type KdcUseRequestedEtypesForTickets as the New Value. Right-click KdcUseRequestedEtypesForTickets, and then click Modify.

Important To enable a client to specify an etype, set the KdcUseRequestedEtypesForTickets registry value to 1. If you remove the KdcUseRequestedEtypesForTickets registry value, the KDC will use the default behavior.</li> Click OK, and then quit Registry Editor.</li> Restart the Key Distribution Center service.

Note This registry change does not take effect until you restart the Key Distribution Center service.</li></ol>

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For additional information, 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

<div class="workaround_section">

WORKAROUND
If you can, upgrade or modify the client to support DES-CBC-MD5. Alternatively, use the Windows 2000 KDC for clients that must specify the encryption type for service tickets.

Additional query words: MIT, Kerberos, Encryption Type, RFC 1510, KDC, Tickets

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe kbwinserv2003presp1fix KB833708

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