Nagios, 2nd Edition

10.4 NRPE Function Test

For a concluding function test, the plugin check_nrpe on the Nagios server is called. The command -H target host returns the IP address specified for the server on which the NRPE service has just been installed:

nagios@linux:nagios/libexec$ ./check_nrpe -H swobspace
CHECK_NRPE: Error - Could not complete SSL handshake.

The error message given here occurs very frequently and causes confusion almost as often because although problems may occur with the SSL handshake, the cause is to be found elsewhere in most cases. You only have an SSL problem if the SSL versions used by the plugin check_nrpe and the NRPE daemon addressed are incompatible or if one of the two software packages was compiled without SSL and the other was compiled ...