i have 2 (very simple) python scripts, which try to connect to each other through port XXXX, if they both run on same machine, there is no problem, but if one of them is on a remote machine, python just says no route to host which i guess means the port is still closed
i tried these:
iptables -I INPUT -p tcp --dport XXXX -j ACCEPT
iptables -I INPUT -p tcp --dport XXXX -j ACCEPT
iptables -I OUTPUT -p udp --dport XXXX -j ACCEPT
iptables -I OUTPUT -p udp --dport XXXX -j ACCEPT
but no luck! what am i doing wrong?

ps: if i set the script on remote to port 80 (which is open and NOT in use), the client side does nothing, just trying to connect...

"No route to host" does not normally mean that the port is closed, but rather that the IP address cannot be reached.

Is the script on the receiving end listening to the proper IP address? Can you connect to the listeninge port with telnet or netcat (nc) from either the local machine or the remote system?

How about posting some lines from the scripts?

well i can ping! but i cant telnet to the port script is running on (80) even if i change the port
i can ssh too
netcat says nothing on connecting, just exits