open new port with IP Tables in Oracle Cloud

To list all IP Tables rules:

iptables -L

To save a backup of the origintal IP Tables rules:

iptables-save > iptables_backup.txt

To allow port 80 in IP Tables:

iptables -A INPUT -p tcp --dport 80 -j ACCEPT

To save the changes and make them permanent:

iptables-save

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