Microsoft KB Archive/942219

= You are prompted to type your user credentials when you try to access a business application that is configured to use the Single Sign-On (SSO) feature on a Windows Vista-based client computer =

Article ID: 942219

Article Last Modified on 10/2/2007

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APPLIES TO


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

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SYMPTOMS
Consider the following scenario:
 * You log on to an Active Directory domain from a Windows Vista-based client computer.
 * You try to access a business application that is configured to use the Single Sign-On (SSO) feature.

Note If the application is configured to use the SSO feature, you can typically access the application without typing your user credentials.

In this scenario, the Kerberos Authentication that is used by the application fails.

This problem occurs if the following conditions are true:
 * The user account that you use is a member of the local Administrators group.
 * On the Windows Vista-based computer, the User Account Control (UAC) feature is turned on.



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

Prerequisites
No prerequisites are required.

Restart requirement
You have to restart your 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, 64-bit version


WORKAROUND
To work around this problem, turn off UAC, or log on by using an account that is not an Administrator account.



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
When you try to access the business application, another application uses the Kerberos protocol to authenticate the user account. During the implementation of the SSO feature, the client computer uses a service ticket for authentication. To obtain this service ticket, the client computer sends a request to Key Distribution Center (KDC) when you log on to the domain. After KDC provides the service ticket to the client computer, the client computer stores it in the credentials cache.

When the application uses the Kerberos protocol to authenticate the user account, the application retrieves the service ticket from the credential cache. However, if the UAC feature is turned on, and the user account is a member of the local Administrators group, the service ticket that is retrieved is empty (all zeros).

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

Additional query words: vista UAC &quot;Kerberos cache&quot; &quot;service ticket session key cache&quot;

Keywords: kbfix kbqfe kbpubtypekc kbexpertiseadvanced kbhotfixserver KB942219

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