how to open a port ubuntu code example
Example 1: ubuntu open port
sudo ufw allow 1191/tcp
Example 2: see what is using a port ubuntu
$ sudo lsof -i:22
Example 3: ubuntu open all port
sudo ufw allow 1:9999/tcp
sudo ufw allow 1191/tcp
$ sudo lsof -i:22
sudo ufw allow 1:9999/tcp