iptables -L
iptables -D fail2ban-SSH -s XXX.XXX.XXX.XXX -j DROP
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http://elastix.wikia.com/wiki/How_to_unban_from_fail2ban
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http://www.reddit.com/r/AskReddit/comments/135e9s/my_father_used_to_tell_me_always_remember_that/