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Authentication in IIS Authentication in IIS verifies whether a user attempting to access a particular website, can indeed access it. Authentication is the process that verifies whether the user can access the site which he/she is attempting to access. The authentication methods which can be used to authenticate users in IIS 6 are listed below. Each authentication method can be used to authenticate users attempting to access Web sites. However, only Anonymous access and Basic Authentication can be used as an authentication method for FTP sites. Anonymous access:  This authentication method is enabled by default for both the Default Web Site and Default FTP Site. Anonymous access allows all anonymous users to access the content of the Web site. Anonymous access is typically utilized for public Web sites which are connected to the Internet. Basic Authentication:  This is the weakest authentication method available for IIS, and should be utilized when you cannot use any other authentica