This screenshot displays the authentication settings in a service connection's Authentication tab when the Enable authentication / proxy option is selected. When the option is selected, a dropdown list appears for selecting the authentication mechanism to use for the service. Depending on the authentication mechanism selected, other options will be displayed for configuring the connection. In this screenshot, the None option is selected in the list, which does not require any other configuration options.
This tab also contains an Allow anonymous access checkbox, which is an option when the None authentication option is selected. The checkbox is not selected.