Are you trying to initiate a connection from outside to your server on port 2059? Or are you trying to connect from server to other computers? If you're trying to connect from other computers, it should be obvious. First of all, what protocol do you want to use? TCP? If you want to accept connections on port 2059 you should simply do this:
iptables -I RH-Firewall-1-INPUT 12 -p tcp --port 2059 -m state --state NEW -j ACCEPT
If you're trying to connect from server to another computers....
.. Maybe that computers aren't configured well..