Oracle Cloud Always Free Compute http port is unavailable.
This is how I accomplished it without having to use iptables.
Create an Ingress Rule for port range 23-90 in Oracle Cloud vps’s dashboard/Networking/Virtual Cloud Networks, for example.
Then, on Ubuntu, install firewalld
sudo apt-get install firewalld sudo systemctl enable firewalld sudo systemctl start firewalld
This just has to be done once. After a reset, it will still be there.
Then, to open port 80, follow these steps:
sudo firewall-cmd --zone=public --add-port=80/tcp --permanent # or --add-service=http sudo firewall-cmd --reload
sudo firewall-cmd --list-all
The same is true when it comes to opening additional ports (s). Refer to the firewalld documentation for instructions on how to delete the port (—remove-port=80/tcp + a —reload).