Noticed this morning that fail2ban was showing as not running on one of my freepbx 14 instances, did some googling, looking at freepbx community etc and eventually found a post by DR7PBX which read:
sudo -u asterisk touch /var/log/asterisk/zulu_out.log
did this followed by:
service fail2ban start
et voila - working again.
Just thought i would let you know. Cheers.