IPTables won't forward TCP port 9453

[nl-firebug]

Hi Folks!

I have been using a Slackware machine as internet gateway for some time. I also have been forwarding TCP ports succesfully (for example ports 2500, 2501, 55800).

Now I have to redirect port 9453 and it won't work. When I run an online port scan, it gives "Stealth" which means that the Slackware machine is just dropping packets arriving at port 9453.

I use the following commands to forward ports:

iptables -A FORWARD -i eth0 -o eth1 -p tcp --dport 9453 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

iptables -A PREROUTING -t nat -p tcp -d ext.ern.al.ip --dport 9453 -j DNAT --to 192.168.0.101:9453

Anybody?

<edit>

Same goes for port 1043.

</edit>

[nl-firebug]

Sorry folks,

The problem is solved. Some n00b installed a firewall on the internal pc.