<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7036.0"> <TITLE>only_from = 127.0.0.1 </TITLE> </HEAD> <BODY>  Can anybody tell me how I use domains names instead of IP address in the nrpe file, I have read somewhere that you can use tcp wrappers which I have tried. My nrpe file looks like this: # default: on # description: NRPE (Nagios Remote Plugin Executor) service nrpe { flags = REUSE socket_type = stream port = 5666 wait = no user = nagios group = nagios server = /usr/local/nagios/bin/nrpe server_args = -c /usr/local/nagios/etc/nrpe.cfg --inetd log_on_failure += USERID disable = no only_from = 127.0.0.1 } And my hosts.allow looks like # # hosts.allow This file describes the names of the hosts which are # allowed to use the local INET services, as decided # by the '/usr/sbin/tcpd' server. # nrpe: 17.0.0.1 monitor.domain.co.uk But I'm still getting Could not complete SSL handshake, is the above configuration correct or can I not use domain names instead of IP's Thanks Martyn </BODY> </HTML>