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It depends upon how you wrote the iptables rules. I'm assuming you've got two ethernet cards if you using this as a router and it would be VERY easy to write rules that open the appropriate ports on one interface, but not the other. So the upshot is that you'll have to post your rules in order for anyone to help.
echo " FWD: Allow all connections OUT and only existing and related ones IN"
#$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -j ACCEPT
$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -j LOG
echo " Enabling SNAT (MASQUERADE) functionality on $EXTIF"
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
#echo " Opening UDP port 5000 for msn"
echo -e "\nrc.firewall-2.4 v$FWVER done.\n"
I had some trial port opening code, but I deleted them completely in order to start from scratch.
You've got a line commented out that pretty much allows all forwarding between exinf and intif. Does it work when you do that rather than the state matching? (Yes, I know its a bad idea to allow all trafic like that, but it may give a clue as to what's wrong)
The other thing is that you are logging.....Do your logs show anything interesting?
I'll admit to a bit of confusion here. This really isn't a restrictive firewall.