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ufw - uncomplicated firewall

well, still too complicated from time to time for me. so let's write it down. see also iptables - or check the ubuntu wiki

enable / disable ufw

ufw enable
ufw disable

manage rules

list rules

ufw status # simple list
ufw status numbered # numbered list, so you can also delete rules
ufw status verbose # some more info, no numbers

delete rules

ufw delete N # where N is the number from the list command above

allow application / port

ufw allow openssh
ufw allow 22
ufw allow from to any port 22 # allow from port 22
ufw allow from to any port 22 proto tcp # allow from port 22, tcp

deny application / port

ufw deny from