Configuring Web Site Authentication Settings
Open web site properties page, “Home Folder” tab:
Authentication
Tick “Allow Anonymous Access” to allow anonymous connection to this web site. Normally, this option must be enabled for the most of web sites.
Tick “Enable Integrated Windows Authentication” to require web site users entering their credentials in order to access the web site. Windows authentication ensures that the user name and password are sent across the network in the form of a hash. This provides secure form of authentication. Normally, this option must be disabled for the most of web sites.
Tick “Enable Basic Authentication” to require web site users entering their credentials in order to access the web site. Basic authentication is part of the HTTP specification and is supported by most browsers; however, user name and password are not encrypted and could present security risks. Normally, this option must be disabled for the most of web sites.