You can check this through command line itself, run the following in nagios server.

# /usr/local/nagios/libexec/check_nrpe -H hostname/clientserverIP -c check_load
CHECK_NRPE: Error – Could not complete SSL handshake.

You may need to cover different scenarios for this to troubleshoot.

1) Check if the particular check is available in client server (For example, check_load, 3ware_check, mail_count etc)

2) Check if xinetd or nrpe stopped running,otherwise try to restart it.

# /etc/init.d/xinetd restart
# /etc/init.d/nrpe restart

3) Make sure you allowed the nagios IP in /etc/xinetd.d/nrpe if nrpe is running under xinetd,like as getting in netstat result.

# netstat -plan | grep :5666
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 25022/xinetd

Check the parameter “only_from” in this file whether allowed nagios IP there.

Then restart xinetd

# /etc/init.d/xinetd restart

OR

Make sure you allowed the nagios IP in /etc/nagios/nrpe.cfg if nrpe is not running under xinetd and as nrpe user itself, like as getting in netstat result.

# netstat -plan | grep :5666
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 248184/nrpe

Make changes to value of parameter “allowed_hosts” in /etc/nagios/nrpe.cfg to as shown below

allowed_hosts=127.0.0.1,nagioserverip

Then restart nrpe

# /etc/init.d/nrpe restart

4) Try to whitelist nagios server IP in firewall.

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