You may not be able to open encrypted files on a wireless network after you change your password in Windows XP (837356)


The information in this article applies to:

  • Microsoft Windows XP Professional SP1
  • Microsoft Windows XP Home Edition SP1
  • Microsoft Windows XP 64-Bit Edition

SYMPTOMS

After you change your password in Microsoft Windows XP, you may not be able to access your encrypted files on a wireless network.

CAUSE

This problem occurs if wireless authentication fails after a Winlogon unlock operation. Data Protection API (DPAPI) does not perform a master key resynchronization.

RESOLUTION

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, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

You must have Windows XP Service Pack 1 installed to apply this hotfix.

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            Size    File name    Platform
   --------------------------------------------------------------------
   05-Apr-2004  20:30  5.1.2600.1513     668,160  Lsasrv.dll
   05-Apr-2004  20:25  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 "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.

MORE INFORMATION

For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages

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

Modification Type:MinorLast Reviewed:10/25/2005
Keywords:kbHotfixServer kbQFE kbWinXPsp2fix kbBug kbfix kbQFE KB837356 kbAudEndUser
©2004 Microsoft Corporation. All rights reserved.