Bit0 is set to 1 if the client certificate is present. Bit1 is set to 1 if the Certificate Authority (CA) of the client certificate is not in the list of recognized CAs on the server.
Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.