Maxopoly

#You probably want to do this in root to reduce the amount of sudos required
su -

#Install iptables if you haven't already
#Alternatively use packet manager of your choice
apt-get install iptables

#Allow all incoming traffic to begin with
iptables -P INPUT ACCEPT
#Clean out any existing input rules. You may also remove the "INPUT" argument and run only "iptables -F" to clear all chains. When doing so, make sure there are no rules in other chains that you still need (list via "iptables -L"), for example Oracle cloud servers will have preset rules, which should not be removed.