Client receives a "403.7 Client certificate required" error message when trying to open a Web page

When a client tries to open a Web page that resides on a Web server that requires a client certificate through Microsoft Internet Security and Acceleration (ISA) Server (Outgoing Web Request), the client receives the following error message:

CAUSE

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only 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 ISA Server 2000 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: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.

File information

The English version of this hotfix has the file attributes (or later) 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.

   Date         Time   Version           Size     File name
   --------------------------------------------------------------
   29-Oct-2003  00:02  3.0.1200.303      178,448  Mspadmin.exe     
   29-Oct-2003  00:02  3.0.1200.303      103,184  Msphlpr.dll      
   29-Oct-2003  00:01  3.0.1200.303      393,488  W3proxy.exe      
   29-Oct-2003  00:02  3.0.1200.303      299,280  Wspsrv.exe       

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