To see all jails:
Our $JAIL is usually
To see which IPs are banned currently:
fail2ban-client status ssh
If you want to unban a host banned by fail2ban on Ubuntu 14.04 or later use this method:
fail2ban-client set $JAIL unbanip $IP #example with a jail named ssh fail2ban-client set ssh unbanip 10.0.0.20
Please don't try to undo the ban by deleting the
iptables rule. Fail2ban will recreate the rule if it is missing but fail2ban has still stored the ban.
On 12.04 hosts fail2ban is too old and doesn't know the
sudo iptables -F
is the only way here since
sudo service fail2ban restart just re-bans the IP again after starting.