If you want to connect remotely to a CUBRID Database that is installed on a Linux System (Fedora, CentOS or Ubuntu), then you have to enable the following ports:
To open any port in Linux you can run iptables commands. Below you can see the commands you need to run to open 8001,8002, 30000 and 33000 ports to any IP address.
iptables -I INPUT -p tcp --dport 8001 -j ACCEPT iptables -I INPUT -p tcp --dport 8002 -j ACCEPT iptables -I INPUT -p tcp --dport 30000 -j ACCEPT iptables -I INPUT -p tcp --dport 33000 -j ACCEPT
You can restrict the ports to just one IP address or group of IP addresses. For more detailed information, check out CUBRID Port and iptables (firewall) Configuration.