You cannot access a WebDAV site whose SSL setting for client certificates is set to Accept if you cancel the Select Certificate dialog box on a computer that is running Windows Vista or Windows Server 2008

Consider the following scenario.

• On a Web Distributed Authoring and Versioning (WebDAV) site, you set the Secure Sockets Layer (SSL) setting for client certificates to Accept.
• On a computer that is running Windows Vista or Windows Server 2008, a user adds this WebDAV site by running the Add Network Location Wizard or the Map Network Drive Wizard.
• After the user finishes running the wizard, the Select Certificate dialog box is displayed. In the Select Certificate dialog box, the user clicks Cancel.

In this scenario, you expect the user to obtain an instant connection to the WebDAV site or to receive a dialog box that requests the user's credentials. Instead, the operation exits unexpectedly.

Notes

• When the SSL setting for client certificates is set to Accept, you expect the user to be able to provide a certificate or credentials to access the WebDAV site.
• This issue does not occur on a computer that is running Windows XP or Windows Server 2003.

Currently, the SSL setting for client certificates on a Web server can be configured to Ignore, to Accept, or to Require. When this setting is configured to Accept, the server (WebDAV site) requires the client to send a certificate. If the client does not have a certificate, the server and the client can negotiate for other authentication mechanisms. However, a WebDAV client that is running Windows Vista or a Windows Server 2008 supports only Ignore or Require for the SSL setting for client certificates. Therefore, when the user who does not select a certificate tries to access the WebDAV site, the operation exits.

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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the �Hotfix Request� page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, the computer must be running one of the following:

• Windows Vista
• Windows Vista SP1
• Windows Server 2008

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 and Windows Server 2008 file information note

• The files that apply to a specific product, milestone (RTM, SPn) can be identified by examining the file version numbers as shown in the following table:

  Version	Product	Milestone	Service branch
  6.0.6000.20xxx	Windows	RTM	LDR
  6.0.6001.22xxx	Windows Vista SP1 and Windows Server 2008 SP1	SP1	LDR

• Service Pack 1 is integrated into Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
• The MANIFEST files (.manifest) and MUM files (.mum) that are installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about how to add a network location, visit the following Microsoft Web site:

Additional file information for Windows Server 2008 and for Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista

For more information, click the following article number to view the article in the Microsoft Knowledge Base: