problem with netcat in knoppix 4.0

[homy1]

I ran netcat server on knoppix 4.0 laptop and netcat client on a fedora core 5 laptop.
on the knoppix
nc -l 9000
on the fedora laptop
nc 192.x.x.x 9000

I didn't connect. There is no firewall on either my machines.
It worked among fedora laptops.

Even if i did like this on the knoppix laptop and it still didn't work.
on one consle
nc -l 9000
on another console
nc localhost 9000

It said: "Knoppix 127.0.0.1 9000 (?) : Connection refused"

Please show some pointers.
Thanks,

[likwid]

Check if the port is indeed open and listening with

netstat -l

[homy1]

It's certain that the port is not opened.
But I dont know how to get it opened.
I guess when we do a command like this "nc -l 9000" it will open the port automatically since I did such thing with fedora core and it works.

[likwid]

Ok well netstat -l will tell you if netcat is indeed listening. Then you'll want to check your iptables with

iptables -L

[homy1]

Well I did check iptables.
All ports are allowed.
There were no denies.

If somebody can verify on their knoppix machine that the following command works:
on one console
nc -l 9000
on another console
nc localhost 9000

mine doesn't work.

Thanks,