By default RedHat comes with strict configuration for protecting you from hackers. If you want to open up certain ports for network traffic you will need to use iptables command.  Here is how you might open tcp port 3030 for network traffic


$ sudo iptables -I INPUT -p tcp -m tcp --dport 3030 -j ACCEPT
$ sudo service iptables save # saves rules to /etc/sysconfig/iptables

Alternatively you can use  firewall tui tool


$ sudo system-config-firewall-tui

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