After installing NRPE on a newly build RHEL 6.3 server I saw this error message. I checked the xinetd configuration file /etc/xinet.d/nrpe and changed the following values:
disable = no only_from = 10.1.0.30
I tried to restart xinetd to propagate the changes, but……
[root@newbox ~]# service xinetd restart xinetd: unrecognized service
I think that xinetd is not in the basic packages anymore. I installed it manually and now it works.
[root@NAGIOS ~]# /usr/lib64/nagios/plugins/check_nrpe -H newbox NRPE v2.12