а есть примеры рабочего конфига captiv portal ?
set services captive-portal-content-delivery rule redirect-http match-direction input
set services captive-portal-content-delivery rule redirect-http term 1 then redirect http://xxxxxx:88
set services captive-portal-content-delivery profile http-redirect cpcd-rules redirect-http
set services service-set sset1 service-set-options routing-engine-services
set services service-set sset1 captive-portal-content-delivery-profile http-redirect
set services service-set sset1 interface-service service-interface si-1/0/0