**** /etc/xinetd.d/check_mk_agent ****

service check_mk
{
	type		= UNLISTED
	port		= 6556
	socket_type	= stream
	protocol	= tcp
	wait		= no
	user		= root
	server		= /usr/bin/check_mk_agent
# configure the IP address(es) of your Nagios server here:
#	only_from       = 192.168.1.106
	disable		= no
}

**************************************

xinetd restart: /System/Library/StartupItems/IPServices/IPServices start
