IIS 6.0 supports the following authentication methods:

1. Anonymous authentication:
This authentication method allows everyone access to
the public areas of your Web sites, without asking for a user name or password.

2. Basic authentication:
This authentication method prompts the user for a user name
and a password, also called credentials, which are sent unencrypted over the
network.

3. Digest authentication:
This authentication method operates much like Basic
authentication, except that passwords are sent across the network as a hash value
for additional security. Digest authentication is available only on domains with
domain controllers running Windows server operating systems.

4. Integrated Windows authentication:
This authentication method uses hashing
technology to scramble user names and passwords before sending them over the
network.

5. NET Passport Authentication:
This authentication method is a user-authentication
service that lets Web site users create a single sign-in name and password for
access to all .NET Passport?enabled Web sites and services. .NET
Passport? enabled sites rely on the .NET Passport central server to authenticate
users; .NET Passport?enabled sites do not host and maintain their own proprietary
authentication systems.


Regards,
Rajanikanth