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Firewall

iptables​

sudo iptables-save > ~/iptables.rules
sudo vim ~/iptables.rules

find the line that has port 22 accept and copy it and editing the port

80, 443, 5432

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT

then load the new rules:

sudo iptables-restore < ~/iptables.rules