DCC through a firewall

Hello,
	I am having difficulties getting my firewall to allow DCC.
What ports must I open?? I found port 6277 but I must be missing
something.. I tried allowing from 6277 to user ports.. and from user
ports to 6277... both UDP and TCP.. and I tried from 6277 on my box
externally.. I must have just gotten confused somewhere along the way..

Thanks in advance,

Luke Galea