Microsoft KB Archive/836878

= Logon failure events are incorrectly recorded for trusted MIT Kerberos realm users =

Article ID: 836878

Article Last Modified on 8/29/2007

-

APPLIES TO


 * Microsoft Windows XP Professional for Itanium-based systems
 * Microsoft Windows XP Professional for Itanium-based systems
 * Microsoft Windows XP Professional

-





SYMPTOMS
When users log on to their user accounts that are from a trusted MIT Kerberos realm, a logon failure event is incorrectly recorded in the security event log of the domain controller. Additionally, if an account lockout policy is enabled, these user accounts may become locked out. However, the users do not experience a logon failure when the lockout occurs.



CAUSE
This problem may occur if the Encrypting File System (EFS) is used to help protect files on the local computer. EFS relies on the Data Protection API (DPAPI) to encrypt a user's key by using a master key. Starting in Microsoft Windows XP, the DPAPI tries to back up this master key to the domain controller every time that the user changes the user logon password. Because a service principal name (SPN) is not correctly formed, authentication that uses an account from a trusted MIT Kerberos realm causes a logon failure on the domain controller.



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

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.

Microsoft Windows XP
  Date         Time   Version           Size     File name ---  05-Apr-2004  21:02  5.1.2600.1513     668,160  Lsasrv.dll

Microsoft Windows XP 64-Bit Edition
  Date         Time   Version         Size       File name    Platform -  05-Apr-2004  21:06  5.1.2600.1513   2,071,552  Lsasrv.dll   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. This problem was first corrected in Microsoft Windows XP Service Pack 2.



MORE INFORMATION
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

Additional query words: Lsasrv authentication

Keywords: kbhotfixserver kbqfe kbwinxpsp2fix kbqfe kbwinxppresp2fix kbfix kbbug KB836878

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.