CHECK_NRPE: Error – Could not complete SSL handshake.

While connecting to remote server from Nagios server using NRPE, Some times we faced this issue “CHECK_NRPE: Error – Could not complete SSL handshake.” If you see this error, don’t panic. This issue can be solve easily within minute.

Issue/Error:

Getting error “CHECK_NRPE: Error – Could not complete SSL handshake” while connecting nagios server trying to connect remote NRPE server.

# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.10.45

CHECK_NRPE: Error - Could not complete SSL handshake.

Solution:

This issue generally comes when NRPE server is not allowing to access service from Nagios server. You need to add nagios server ip in nrpe configuration file.

Step 1:

Edit NRPE configuration file /etc/nagios/nrpe.cfg and search for allowed_hosts configuration variable.

Step 2:

Add your nagios servers ip address in allowed_hosts. For multiple nagios servers add all ips with comma-delimited list. It also supports subnets (like: 192.168.10.0/24).

allowed_hosts=127.0.0.1, 192.168.10.3, 192.168.10.4

After making above changes restart nrpe service

# service nrpe restart

Step 3:

Finally verify changes again using check_nrpe command from nagios server

# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.10.45

NRPE v2.14