To open a port on Ubuntu, follow these steps. First, use the command `sudo ufw allow [port_number]` to allow traffic through the specified port. For RDP, you might use `sudo ufw allow 3389/tcp`. Next, verify the changes with `sudo ufw status`. For residential servers, ensure your router forwards the port correctly. This setup facilitates secure connections for services like RDPextra. Always review security implications when opening ports.
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