Had a look at audit trail, and it seems it isnt being executed!??
ip access-list session "captiveportal" no any host 17.0.0.0 "255.0.0.0" permit > -- command execution failed
If I look at the command section in gui.. its try to do:
no any host 17.0.0.0 255.0.0.0 any permit
Yet the "any" part of this doesnt seem to be an option when I view the help menu whilst manually entering the code... so I try permit, and get "unknown policy"