So, I installed NRPE from source while installing xinetd and openssl-devel.
So, when I ran the test from the nagios server
/usr/local/nagios/libexec/check_nrpe -H client IP
I get a positive response
But, when a run an actual nrpe command to test my client
/usr/local/nagios/libexec/check_nrpe -H "client_ip" -c check_sda1
NRPE: Unable to read output
I get an error message. I know that I've got the "rights" correct. But I'm a little stumped as to the error message.
drwxrwxr-x 5 nagios nagios 4096 Jan 21 13:16 nagios
drwxrwxr-x 2 nagios nagios 4096 Jan 21 13:14 libexec
-rwxrwxr-x 1 nagios nagios 66085 Jan 21 13:14 check_nrpe
After some google search - they pretty much point to having rights.