control_localhost 
 
-  Type: Boolean
  -  Range / Valid values: on, off
  -  Default: on
  -  Group: Obsolete
 
 
Limits the http (html) control to the localhost. This option must be placed in motion.conf and not in a thread config file.
This option has been replaced  by webcontrol_localhost
By setting this to on, the control using http (browser) can only be accessed on the same machine on which Motion is running.