I can tell you with certainty that your problem is going to be with the fact that you're changing out an external port range for an internal port number and vice-versa… This makes for a recipe to get signals crossed as there is variation in the ports that are used. Also, make sure that this forward rule is in place both for TCP and for UDP ports as torrent clients use both.
My suggestion would be to use the standard method of port forwarding and using just the single port that your torrent client requires, as the majority of us do. When you leave a port range forwarded to a single port, it creates a much more complicated situation than you really need to, ESPECIALLY if you do not have both the DNAT and SNAT properly configured to convert the packets on the fly.
 
		
		
		
	

