The trigger of the brute_force_notice_ip.sh only happens with notices, DirectAdmin has an option to prevent the sending of the notices, but still call the scripts normally to block the IP.
1.) SSH into the server using root access, then type the command as below:
echo "hide_brute_force_notifications=1" >> /usr/local/directadmin/conf/directadmin.conf
2.) Restart DirectAdmin service to have the option activate.