How To See Which Ports Are Open On A Particular Firewall Using the terminal I was wondering if it would be possible to see a list of all the active firewalls on a particular system that I have shelled into. I want to be able to see which ports are active pertaining to each firewall, so that I can change the restrictions.

You could scan your localhost for open ports using a tool like nmap.


nmap -v -sT localhost


nmap can be built from source or installed from the repo of most (if not all) major distros.