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A local administrator can unlock a session that is opened by a domain administrator on a Windows XP-based computer

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article has been archived. It is offered "as is" and will no longer be updated.
When you log on to a computer by using a domain administrator account, and then you lock the computer, a local administrator for the computer may be able to unlock the session and access your session without using your domain administrator password.
This problem occurs when you enable Client Side Caching (CSC) on the computer. CSC synchronization adds a Setup option in the Unlock Computer dialog box. The Setup option permits local administrators to use their local administrator credentials to access the environment of the account that is currently logged-on without using the password for that account.

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 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: Note 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.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.

Windows XP

   Date         Time   Version            Size    File name   ----------------------------------------------------------   18-Mar-2004  00:04  5.1.2600.1331     196,096  Mobsync.dll         17-Mar-2004  02:05  5.1.2600.1364     135,680  Mobsync.exe      

Windows XP 64-Bit Edition

   Date         Time   Version            Size    File name     Platform   ---------------------------------------------------------------------   17-Mar-2004  23:58  5.1.2600.1331     422,912  Mobsync.dll   IA-64   17-Mar-2004  02:05  5.1.2600.1364     363,008  Mobsync.exe   IA-64   18-Mar-2004  00:04  5.1.2600.1331     196,096  Wmobsync.dll  x86   17-Mar-2004  02:05  5.1.2600.1364     135,680  Wmobsync.exe  x86
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article. 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

Article ID: 839009 - Last Review: 01/12/2015 23:24:43 - Revision: 3.0

Microsoft Windows XP Professional, Microsoft Windows XP Home Edition

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