The first thing you need to do is find out the IP address of the banned user.

iptables -L

This will list the current rules that exist in iptables.

You’ll see one listed as fail2ban-ssh, likely with an ip address.

To clear it, issue the follow command.

iptables -D fail2ban-ssh -s <ip_address_to_be_set_free> -j DROP

I have used the code above with Debian wheezy successfully.

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