You can enable guest users to access FSSO security policies. Guests are users who are unknown to Windows AD and servers that do not logon to a Windows AD domain.

To enable guest access in your FSSO security policy, add an identity-based policy assigned to the built-in user group FSSO_Guest_Users. Specify the services, schedule and UTM profiles that apply to guest users — typically guests have access to a reduced set of services. See “Creating security policies”.