Microsoft KB Archive/811802

= MIT Kerberos v5 Authenticated Users Cannot Access Active Directory Resources =

Article ID: 811802

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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For a Microsoft Windows Server 2000 version of this article, click the following link: Users Who Are Authenticated by MIT Kerberos v5 Cannot Access Active Directory Resources



SYMPTOMS
If you are a Microsoft Windows XP user who is authenticated by an MIT Kerberos v5 realm, you may receive an &quot;Access Denied&quot; error message when you try to access a resource or share in an Active Directory directory service domain.



CAUSE
This problem occurs because multiple Kerberos Ticket-Granting Service Requests (KRB_TGS_REQ) can be sent to a Massachusetts Institute of Technology (MIT) Kerberos v5 Key Distribution Center (KDC) at the same time. If information in any of the most recent requests matches the server name, client name, current time, and microsecond fields of the KRB_TGS_REQ authenticator, the MIT Kerberos v5 KDC will return the &quot;Access Denied&quot; error message.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

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

The global 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        Size     File name 20-Mar-2003 08:40  5.1.2600.1188  272,384  Kerberos.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Windows XP Service Pack 2.



MORE INFORMATION
Each authenticator (KRB_AP_REQ), including the ones that are contained in a KRB_TGS_REQ message, must have a different set of these values to avoid being detected as a replay. The other content of the KRB_TGS_REQ message, including the specification where service principal is requested, is not cached. If two KRB_TGS_REQs contain authenticators with the same timestamps, they are seen as a replay attack even if the rest of the authenticator is different (for example, the KRB_TGS_REQs for different principals).

Keywords: kbhotfixserver kbqfe kbwinxpsp2fix kbqfe kbwinxppresp2fix kbfix kbbug KB811802

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