If you want to connect to a port, some process should be running on that port. So you need to make sure that service is running on that port. Also, if you have any firewall, you will need to open that port in the firewall.
If you are using apf, you can add this port to /etc/apf/conf.apf
Or if you are simply using iptables something like this will do.
iptables -I INPUT -s 0/0 -p tcp --dport 3300 -j ACCEPT
First make sure service is running.