A read-only enumerated value reporting whether the controller's Portal service, which presents the captive user login portal, is running, stopped, or disabled. This is the service end users directly interact with to authenticate, so any state other than running usually means new users cannot get past the login page at all. A wave of user complaints about being unable to log into Wi-Fi would prompt the admin to check portalService first, since a stopped portal blocks the whole sign-in flow.