Error message when you try to connect to a Web site that is published by using ISA Server 2004 Service Pack 2: "403" or "500"
When you try to connect to a Web site that is published by using Microsoft Internet Security and Acceleration (ISA) Server 2004 Service Pack 2 (SP2), you receive an error message. If the ISA Server Web listener has Basic authentication enabled, you receive the following error message:
Error Code: 403 Forbidden.
The page must be viewed over a secure channel (Secure Sockets Layer (SSL)). Contact the server administrator. (12211)
If the ISA Server Web listener has RADIUS authentication or Microsoft Outlook Web Access Forms-Based authentication (Cookie-auth) enabled, you receive the following error message:
Error Code: 500 Internal Server Error.
An internal error occurred. (1359)
Lire la fiche de la base de connaissance : http://support.microsoft.com/kb/912122/en-us