Idem, j'ai le même problème de fail2ban. Install bonobox sur Debian 9 toute fraiche. Je n'y comprends rien.
fail2ban-client status 0 < 17:03:21
Status
|- Number of jail: 8
`- Jail list: nginx-auth, nginx-badbots, nginx-dos, postfix, postfix-rbl, ssh, sshd, vsftpd
Ses 3 commandes reviennent toutes les 5 min.
2018-10-28 17:00:13,019 fail2ban.transmitter [26226]: WARNING Command ['status', '-'] has failed. Received UnknownJailException('
-',)
2018-10-28 17:00:13,303 fail2ban.transmitter [26226]: WARNING Command ['status', 'Jail'] has failed. Received UnknownJailException('Jail',)
2018-10-28 17:00:13,587 fail2ban.transmitter [26226]: WARNING Command ['status', 'list:'] has failed. Received UnknownJailException('list:',)