ipfilter allowing irc

[Dave]

Hello,
I've got an ipfilter firewall. I want to allow irc traffic from the irc
servers to one of my machines. I've got a pass in rule for port 6667 in my
ipf.rules file for the machine in question and ipnat is redirecting
traffic with rdr. However, when i initiate an irc connection i keep
getting remote machine refused the connection. Any sites or pointers on
this?
Thanks.
Dave.