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root@host:~# /usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.12

root@host:~# netstat -at | grep nrpe
tcp        0      0 *:nrpe                  *:*                     LISTEN

[root@nagios ~]# /usr/local/nagios/libexec/check_nrpe -H host.domain.cz
Connection refused by host

root@host:~# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:nrpe
ACCEPT     all  --  anywhere             anywhere
REJECT     all  --  anywhere             loopback/8          reject-with icmp-port-unreachable
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:www
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:https
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh
ACCEPT     icmp --  anywhere             anywhere            icmp echo-request
REJECT     all  --  anywhere             anywhere            reject-with icmp-port-unreachable

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
REJECT     all  --  anywhere             anywhere            reject-with icmp-port-unreachable

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere

root@host:~# cat /etc/xinetd.d/nrpe
# 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       = 11.22.33.44 127.0.0.1
}

root@host:~# cat /etc/hosts.allow
nrpe: LOCAL, 11.22.33.44

root@host:~# cat /etc/hosts.deny
nrpe: ALL

[root@nagios ~]# telnet host.domain.cz 5666
Trying 22.44.66.88...
Connected to host.domain.cz (22.44.66.88).
Escape character is '^]'.

root@nagios:~# netstat -at | grep nrpe
tcp        0      0 *:nrpe                  *:*                     LISTEN
tcp        0      0 host.domain.cz:nrpe   44.33.22.11.rev.c:38130 ESTABLISHED