: Select Allow the connection , choose the profiles (Domain, Private, Public), and give your rule a name like "Unblock [Port Number]". Linux (Ubuntu/Debian)
Unblocking a port creates a hole in the network's defensive wall. This introduces specific vulnerabilities.
sudo iptables-save > /etc/iptables/rules.v4 # Debian/Ubuntu sudo service iptables save # RHEL/CentOS 6
