Who managed to make Radius custom error page where Radius responses could be shown to users in case of Authentication failure? There is a statement in Captive portal -> Authentication error page contents section: "You may include "$PORTAL_MESSAGE$", which will be replaced by the error or reply messages from the RADIUS server, if any." But I never managed to get any error or reply from Radius here. Some code which shows "$PORTAL_MESSAGE$" value will be much appreciated.