About Web user authentication

The guidelines and standards of your company should specify the way that Microsoft Internet Explorer handles authentication at logon. The User Authentication option in the Internet Explorer Security Settings defines how the HTTP user authentication is handled.

The User Authentication selections are the following:

Anonymous logon	Disables the HTTP authentication and uses the guest account only for authentication using the Common Internet File System (CIFS) protocol
Automatic logon only in intranet zone	Prompts for user name and password in other zones
Automatic logon with current user name and password	Tries the logon using the Windows NT Challenge Response as the authentication protocol. If the server supports the NT Challenge Response, the logon uses the network user name and password. If the NT Challenge Response is not supported, the user provides a user name and password
Prompt for user name and password	Prompts for the user name and password