Certificate Selection Prompt Appears Only for the First Internet Explorer Window That Opens

When you set the Require Client Certificates option in Internet Information Server (IIS) version 5.0, to prompt users for a certificate selection each time they try to open a restricted folder from different Internet Explorer windows, the requirement seems to affect only the first client window that opens.

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 2.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To manually change the default so that the system prompts the user for a certificate selection for each window, change the MultipleProcessClientCache registry value:

1. Start Registry Editor (Regedt32.exe).
2. Locate the MultipleProcessClientCache value under the following key in the registry:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\Schannel
   If there is no MultipleProcessClientCache value, go to the Edit menu and create the value.
   
   
3. On the Edit menu, click DWORD, type 00000001, and then click OK.
4. Quit Registry Editor.