You are prompted for authentication four times when you try to access a file on a WebDAV server from a computer that is running Windows Vista or Windows Server 2008

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Article ID: 954807 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • On a computer that is running Windows Vista or Windows Server 2008, you try to access a file on a Web Distributed Authoring and Versioning (WebDAV) server.
  • This WebDAV server is located on an external network.
  • You access the WebDAV server by using a proxy server that requires authentication.
Before you can open the file in this scenario, you are prompted for authentication four times. You expect to be prompted for authentication only two times.

Note You expect to be prompted to authenticate one time against the proxy server and the other time against the WebDAV server.

CAUSE

The behavior occurs because the WebDAV client does not correctly handle the "HTTP/1.1 407 Proxy Authentication Required ( Access is denied. ) /(HTTP_STATUS_PROXY_AUTH_REQ)" error. When this error is returned to the WebDAV client from the proxy server, the client maps this to the "ERROR_ACCESS_DENIED" error. Therefore, you are redundantly prompted for credentials.

RESOLUTION

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

To apply this hotfix, the computer must run one of the following:
  • Windows Vista Service Pack 1 (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 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.0.6001.2225254,27227-Aug-200803:33x86
Mrxdav.sys6.0.6001.22252113,66427-Aug-200800:52x86
Webclnt.dll6.0.6001.22252198,14427-Aug-200803:33Not Applicable
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Davclnt.dll6.0.6001.2225272,70427-Aug-200804:08x64
Mrxdav.sys6.0.6001.22252137,72827-Aug-200801:25x64
Webclnt.dll6.0.6001.22252215,55227-Aug-200804:08x64
Mrxdav.sys6.0.6001.22252113,66427-Aug-200800:52x86

STATUS

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

MORE INFORMATION

After you install this hotfix, the WebClient service sends the default logged-in credentials instead of the server credentials to pass through the proxy server. 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 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
Collapse this tableExpand this table
File namePackage_1_for_kb954807~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,777
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_2_for_kb954807~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size2,163
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_3_for_kb954807~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size2,228
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,641
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_client~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,430
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,408
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_server~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,430
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameX86_7a0185c47750b62e7046c4db4a5c311e_31bf3856ad364e35_6.0.6001.22252_none_a6b6f6b8bed11891.manifest
File versionNot Applicable
File size709
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameX86_f3437d056932d20f2b715eb8c7b94c6f_31bf3856ad364e35_6.0.6001.22252_none_d9e6545a2fa6344f.manifest
File versionNot Applicable
File size1,059
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameX86_fe98db58a8f12d5be304a513f9eb6163_31bf3856ad364e35_6.0.6001.22252_none_8f31dc39cce04c3b.manifest
File versionNot Applicable
File size1,412
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameX86_microsoft-windows-webdavredir-davclient_31bf3856ad364e35_6.0.6001.22252_none_9422f8e86b8395d8.manifest
File versionNot Applicable
File size5,069
Date (UTC)27-Aug-2008
Time (UTC)04:12
File nameX86_microsoft-windows-webdavredir-mrxdav_31bf3856ad364e35_6.0.6001.22252_none_150074e0deffffee.manifest
File versionNot Applicable
File size13,642
Date (UTC)27-Aug-2008
Time (UTC)04:09
File nameX86_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.0.6001.22252_none_557b5965ccf5fed5.manifest
File versionNot Applicable
File size6,904
Date (UTC)27-Aug-2008
Time (UTC)04:13
Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameAmd64_636ca8740c25f08cd1b60a39ccae06ec_31bf3856ad364e35_6.0.6001.22252_none_57d0ae67d2e8a224.manifest
File versionNot Applicable
File size2,478
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameAmd64_77de360c45364cef74f5238f286bfe40_31bf3856ad364e35_6.0.6001.22252_none_ded929c50f93784a.manifest
File versionNot Applicable
File size2,126
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameAmd64_microsoft-windows-webdavredir-davclient_31bf3856ad364e35_6.0.6001.22252_none_f041946c23e1070e.manifest
File versionNot Applicable
File size5,087
Date (UTC)27-Aug-2008
Time (UTC)05:19
File nameAmd64_microsoft-windows-webdavredir-mrxdav_31bf3856ad364e35_6.0.6001.22252_none_711f1064975d7124.manifest
File versionNot Applicable
File size13,906
Date (UTC)27-Aug-2008
Time (UTC)05:17
File nameAmd64_microsoft-windows-webdavredir-webclient_31bf3856ad364e35_6.0.6001.22252_none_b199f4e98553700b.manifest
File versionNot Applicable
File size6,934
Date (UTC)27-Aug-2008
Time (UTC)05:21
File namePackage_1_for_kb954807~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,860
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_2_for_kb954807~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,922
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,375
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_client~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,438
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,416
Date (UTC)27-Aug-2008
Time (UTC)18:30
File namePackage_for_kb954807_server~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,438
Date (UTC)27-Aug-2008
Time (UTC)18:30
File nameWow64_microsoft-windows-webdavredir-mrxdav_31bf3856ad364e35_6.0.6001.22252_none_7b73bab6cbbe331f.manifest
File versionNot Applicable
File size8,609
Date (UTC)27-Aug-2008
Time (UTC)04:05

Properties

Article ID: 954807 - Last Review: October 6, 2008 - Revision: 2.0
APPLIES TO
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Ultimate
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
Keywords: 
kbautohotfix kbexpertiseadvanced kbfix kbqfe kbhotfixserver KB954807

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