We're trying to set up Nagios on our VPS and having a lot of trouble. Has anyone else managed to get it working?
We installed NRPE on the box and started it up; it started fine and said it was bound to port 5666. Both lsof and 'netstat -at | grep nrpe' agree that it was bound to that port. Yet, when we tried to verify this by doing "telnet $IPADDRESS 5666" from the VPS command line, telnet just hung, unable to even locate the server. We thought maybe there was some kind of firewall or something, so we tried "telnet 127.0.0.1 5666", which usually bypasses such things; same (non)result. Ditto for when we tried from an outside box.