FIX: Cannot connect to a Web folder if the proxy server requires authentication

View products that this article applies to.

SYMPTOMS

When you access a Web Folder on a computer configured with either Microsoft Office XP or the client components for Microsoft SharePoint Portal Server 2001, you may receive one of the following error messages if the folder is behind a firewall or proxy server, and proxy authentication is required:

Cannot connect to the Web server [Folder URL]. The server could not be located, or may be too busy to respond. Please check your typing or check to make sure the Web server is available.

-or-

Documents in the folder are not available. The folder may have been moved or deleted, or network problems may be preventing a connection to the server.

When you open documents directly from Office XP (instead of opening them from My Network Places or the Web Folder shell extension), you may not see the problem right away, but when you prepare to save the file, or when you reopen the file after you close it, you may see one of these error messages.

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CAUSE

The Distributed Authoring and Versioning (DAV) protocol provider for the Microsoft Data Access Internet Publishing Provider (MSDAIPP) does not perform authentication when it receives a 407 Proxy Authentication response from a proxy server. MSDAIPP is used by Office XP and the shell namespace extension installed by the SharePoint client, and the problem can affect your ability to connect to certain Web servers.

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RESOLUTION

Hotfix information

This problem was first fixed in a hotfix that is now contained in a service pack. If you have installed SharePoint Portal Server 2001 Service Pack 3 or a later service pack, you do not have to apply the hotfix.

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Service pack information

This problem was first corrected in SharePoint Portal Server 2001 Service Pack 3.To resolve this problem, obtain the latest service pack for Microsoft SharePoint Portal Server 2001. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

312963 (http://support.microsoft.com/kb/312963/ ) How to obtain the latest SharePoint Portal Server 2001 service pack

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Office XP or SharePoint Portal Server service pack that contains this fix.

To resolve this problem immediately, download the fix by clicking the download link later in this article or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS (http://support.microsoft.com/default.aspx?scid=fh;en-us;cntactms)

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.

The English version of this update 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 tool in Control Panel.

Office XP

      
   Date         Time   Version             Size   File name
   --------------------------------------------------------------
   20-Feb-2003  20:25                  2,879,516  Msdaipp.msp
   20-Feb-2003  21:41                  3,305,508  Msdaippff.msp
   20-Feb-2003  20:48                      6,679  Readme.txt

SharePoint Portal Server 2001

   Date         Time   Version             Size   File name
   --------------------------------------------------------------
   14-Feb-2003  18:20  5.50.4134.600     530,192  Q813654.exe
   14-Feb-2003  18:20                      4,245  Readme.txt

After the hotfix is installed, the English version of this fix will have the file attributes (or later) that are listed in the following table:

   
   Date         Time   Version             Size   File name
   --------------------------------------------------------------
   11-Feb-2003  12:51  10.145.6011.7   1,187,840  Msdaipp.dll

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STATUS

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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 SharePoint Portal Server 2001 Service Pack 3.

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