DMZ is a zone on the router to which all ports are open, i.e. no firewall.
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BT is short for bittorrent....
Please forward the port the client is using instead for security-reasons.
"The same ferocity that our founders devoted to protect the freedom and independence of the press is now appropriate for our defense of the freedom of the internet. The stakes are the same: the survival of our Republic". Al Gore, The Assault on Reason