Error: Nagios/Icinga (Debian Squeeze) - CHECK_NRPE: Error - Could not complete SSL handshake.
You try to connect from your Nagios/Icinga host to a remote Nagios NRPE server like this...
/usr/lib/nagios/plugins/check_nrpe -H 18.104.22.168
... and get the following error:
Open /etc/nagios/nrpe.cfg on the remote Nagios NRPE server...
... and add the IP address of your Nagios/Icinga host (22.214.171.124 in this example) to the allowed_hosts line:
[...] # ALLOWED HOST ADDRESSES # This is an optional comma-delimited list of IP address or hostnames # that are allowed to talk to the NRPE daemon. # # Note: The daemon only does rudimentary checking of the client's IP # address. I would highly recommend adding entries in your /etc/hosts.allow # file to allow only the specified host to connect to the port # you are running this daemon on. # # NOTE: This option is ignored if NRPE is running under either inetd or xinetd allowed_hosts=127.0.0.1,126.96.36.199 [...]
Save the file and restart the NRPE server: