Firewall

Open ports

Inspired by https://gist.github.com/mrladeia/da43fc783610758c6dbcaba22b4f7acd.

Go to Networking > Virtual cloud networks > (select your VCN) > Security > Default Security List, under Security Lists section > Security rules > Add Ingress Rules

• Source CIDR 0.0.0.0/0
• Source Port Range : leave empty for “All”

Once done, go back to your VPS and edit the file /etc/iptables/rules.v4 provided by Oracle.

Right below the line -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT, add the ports you want to open. Let’s say you want to open 80 and 443, simply add:

-A INPUT -p tcp -m state --state NEW -m multiport --dports 80,443 -j ACCEPT

You can also add a single port using the following:

-A INPUT -p tcp -m state --state NEW -m tcp --dport 8776 -j ACCEPT

You can now either reboot or run sudo /sbin/iptables-restore < /etc/iptables/rules.v4.