You use a smart card to log on to a computer that is running Windows XP and that has Internet Explorer 7 or Internet Explorer 8 installed. In this scenario, when you use Internet Explorer to access a Web site that requires Digest authentication, the authentication fails and you receive an authentication required message.
Note This problem does not occur on computers that are running Windows Vista or Windows Server 2008.
This issue occurs because the Wdigest.dll component does not add a logon session to the list of logon sessions if the password field is blank. This behavior occurs when you use a smart card to log on to the computer. However, the smart card logon session is not added to the list of logon sessions. When Digest authentication is required, the Wdigest.dll component searches for the logon session in the logon session list. However, because the smart card logon session is not added to the list, Digest authentication fails.
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.
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, submit a request to 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.
To apply this hotfix, your computer must be running Windows XP Service Pack 2 (SP2) or Windows XP Service Pack 3 (SP3).
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any previously released hotfix.
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.
For all supported x86-based versions of Windows XP SP2
For all supported x86-based versions of Windows XP SP3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about Digest authentication, visit the following Microsoft Web site: