Why is my legitimate IP is blocked by DenyHosts?

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http://unix.stackexchange.com – My ip is blocked by DenyHosts but I followed the tutorial at http://denyhosts.sourceforge.net/faq.html#3_7 and in my allowed-hosts file I've the ip block XX.XX... How can I avoid my ip is blocked by DenyHosts again? Why doesn't the allowed-hosts rule didn't work? (HowTos)