Configure the service in /etc/services. Add the following line in that file:
firelisten 999/tcp
Pick an TCP port number.
The package provides a configuration file /etc/xinetd.d/firelisten. Edit the file and turn the service on (disable = no).
For the inetd server, edit the file /etc/inetd.conf and add the following line:
firelisten stream tcp nowait root tcpd /usr/lib/linuxconf/lib/firelisten firelisten --updfw /sbin/linuxconf --modulemain firewall --update