NRPE is a little funky. Make sure you've added: nrpe 5666/tcp to your services file. Next on the machine running nagios try to telnet to port 5666 on a machine running nrpe telnet remote.host.net 5666 If it connects, great. If not then the issues is on the remote host somewhere, either with a firewall, or nrpe not being configured correctly or just not running for some reason. I stopped using NRPE all together about a year ago and I do everything via SSH and keys now. -Mike
