Users log in to Identity Server when they request access to a web resource. Access Gateway redirects users from the resource to Identity Server to provide the required credentials for the resource. After they are authenticated, they are not prompted for credentials again, unless a resource requires credentials that they haven’t already supplied.
Users can log directly in to Identity Server and access either the default user portal or the legacy user portal. Alternatively, they can access information about the available Web Services Description Language (WSDL) services.