Na verdade, o ufw reset não funcionou, eu encontrei esta resposta no ubuntuforums para resetar o iptables
##
## set default policies to let everything in
ip6tables --policy INPUT ACCEPT;
ip6tables --policy OUTPUT ACCEPT;
ip6tables --policy FORWARD ACCEPT;
##
## start fresh
ip6tables -Z; # zero counters
ip6tables -F; # flush (delete) rules
ip6tables -X; # delete all extra chains
# IPv4
##
## set default policies to let everything in
iptables --policy INPUT ACCEPT;
iptables --policy OUTPUT ACCEPT;
iptables --policy FORWARD ACCEPT;
##
## start fresh
iptables -Z; # zero counters
iptables -F; # flush (delete) rules
iptables -X; # delete all extra chains