fail2ban/config/filter.d/nagios.conf

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# Fail2Ban filter for Nagios Remote Plugin Executor (nrpe2)
# Detecting unauthorized access to the nrpe2 daemon
# typically logged in /var/log/messages syslog
#
[INCLUDES]
# Read syslog common prefixes
before = common.conf
[Definition]
_daemon = nrpe
failregex = ^%(__prefix_line)sHost <HOST> is not allowed to talk to us!\s*$
ignoreregex =
# DEV Notes:
#
# Author: Ivo Truxa - 2014/02/03