When you use Windows Internet Explorer to access files on a Web Distributed Authoring and Versioning (WebDav) site on a Windows Vista-based computer, you receive a dialog box that prompts you to type your user credentials.

Note A SharePoint Portal Server site is an example of a WebDav site.

This problem occurs if you disable the Automatically detect settings option in Internet Explorer and instead use an automatic configuration script to configure proxy settings. For information about how to enable the Automatically detect settings setting, see the "More Information" section.

This problem does not occur in Windows XP.

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When you use Internet Explorer to access the WebDAV site, Internet Explorer uses Windows HTTP Services (WinHTTP). WinHTTP sends user credentials only in response to requests that occur on a local intranet site during an authenticated logon process. However, WinHTTP does not check the security zone settings in Internet Explorer to determine whether a Web site is a local intranet site. Instead, WinHTTP depends on the proxy settings in Internet Explorer to determine whether a Web site is a local intranet site. If the Automatically detect settings option is not enabled, any autoconfiguration script that is defined will not be processed. WinHTTP will not identify the WebDAV site as a local intranet site. Therefore, WinHTTP will send out a request without user credentials, and you will be prompted to type user credentials.

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Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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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.

Prerequisites

No prerequisites are required.

Restart requirement

You have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other 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, 32-bit versions

File name	File version	File size	Date	Time	Platform
Update.mum	Not applicable	1,784	01-Sep-2007	14:15	Not applicable
X86_e209eb9c50065114506b75a90cc3617e_31bf3856ad364e35_6.0.6000.20673_none_9d3219b632d67ca5.manifest	Not applicable	709	01-Sep-2007	14:15	Not applicable
X86_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.0.6000.20673_none_53807765cfdec4cf.manifest	Not applicable	7,339	01-Sep-2007	14:15	Not applicable
Webclnt.dll	6.0.6000.20673	194,560	01-Sep-2007	02:15	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_c5567ec1450ac7f5b02dd3a6e7b00a38_31bf3856ad364e35_6.0.6000.20673_none_9e331cecb38bace3.manifest	Not applicable	1,066	01-Sep-2007	14:15	Not applicable
Amd64_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.0.6000.20673_none_af9f12e9883c3605.manifest	Not applicable	7,369	01-Sep-2007	14:20	Not applicable
Update.mum	Not applicable	2,021	01-Sep-2007	14:15	Not applicable
Webclnt.dll	6.0.6000.20673	211,456	01-Sep-2007	03:16	x64

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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 Windows Vista Service Pack 1.

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To enable the Automatically detect settings setting, follow these steps:

1.	Click Start, type Inetcpl.cpl in the Start Search box, and then press ENTER.
2.	Click the Connections tab, and then click LAN Settings.
3.	Click to select the Automatically detect settings check box, and then click OK two times.

For more information about authentication in WinHTTP, visit the following Microsoft Web site: For more information, click the following article number to view the article in the Microsoft Knowledge Base: For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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