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I set debug mode in nagios.cfg to '2048' and noticed that nagios was looking for the check_icmp in /usr/lib/nagios/plugins (doesn't exist) instead of /usr/lib64/nagios/plugins. So i created a symbolic link for /usr/lib/nagios/plugins as a temporary work-around and now check_icmp works.
It's odd because resource.cfg defines the plugin directory as