Microsoft KB Archive/941853

= You are prompted to type your user credentials when you use Internet Explorer to access files on a Web Distributed Authoring and Versioning (WebDav) site on a Windows Vista-based computer =

Article ID: 941853

Article Last Modified on 10/24/2007

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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 Enterprise
 * Windows Vista Home Premium
 * Windows Vista Ultimate

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SYMPTOMS
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 &quot;More Information&quot; section.

This problem does not occur in Windows XP.



CAUSE
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.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may 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 immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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, 64-bit 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
To enable the Automatically detect settings setting, follow these steps:
 * 1) Click Startvistastartbutton.jpg], 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:

http://msdn2.microsoft.com/en-us/library/aa383144.aspx

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

936611 Internet Explorer 7 incorrectly recognizes an intranet Web site as an Internet Web site

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: kbqfe kbpubtypekc kbexpertiseadvanced kbexpertisebeginner kbhotfixserver KB941853

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