Microsoft KB Archive/941808

= After you lock and then unlock a Windows Vista-based client computer, you may be prompted for user credentials before you can access network resources =

Article ID: 941808

Article Last Modified on 10/15/2007

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APPLIES TO


 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Home Premium
 * Windows Vista Ultimate
 * Windows Vista Enterprise

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SYMPTOMS
Consider the following scenario:
 * You lock and then unlock a Windows Vista-based client computer.
 * You try to access network resources.

In this scenario, you may be prompted for user credentials.

Note This problem does not occur on a Windows XP-based client computer.



CAUSE
This problem may occur in an environment in which two-factor authentication products are used to deploy a one-time password token. In this environment, Windows Vista does not use the existing Kerberos ticket-granting tickets (TGTs) to request a ticket for the network resource. However, Windows Vista does perform an Authentication Service (AS) request. Therefore, you may be prompted for user credentials.



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 Windows Vista 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
No prerequisites are required.

Restart requirement
You must restart the computer after you apply this hotfix.

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

Registry information
To use this hotfix, you do not have to make any changes to the registry.

File information
The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

Windows Vista, x64-based versions


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



MORE INFORMATION
Two-factor authentication provides improved security because it requires that the user provide the following authentication items:
 * The combination of a valid user name and a password
 * A token or a certificate

A typical example of two-factor authentication that uses a certificate involves using a smart card. The smart card contains the certificate.

A one-time password system requires that you use a new password every time that you log on. For more information, visit the following Microsoft Web site:

http://www.microsoft.com/technet/archive/community/columns/security/robi/ro021400.mspx?mfr=true

For more information about Kerberos authentication, visit the following Microsoft Web site:

http://technet.microsoft.com/en-us/library/Bb742516.aspx

For more 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

Keywords: kbfix kbqfe kbpubtypekc kbexpertisebeginner kbhotfixserver KB941808

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