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check_nrpe -H localhost

why is it I’m getting this using NRPE 2.15?
# /usr/local/nagios/libexec/check_nrpe -H localhost
CHECK_NRPE: Error – Could not complete SSL handshake.

but, when I try
#/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
NRPE v2.15