Recover from a broken ufw ruleset
Locked out by ufw? Get back in through the provider console, disable the firewall, read the rules that actually applied, and stop it happening again.
#ufw
Filtering by topic #ufw · clear
Docker bypasses UFW: why and how to fix it
Docker publishes container ports with iptables rules that skip UFW, so a denied port still answers the internet. See the mechanism and the fixes that work.
UFW firewall basics: set up a VPS firewall
UFW is the simple way to run a firewall on a VPS. Set a default-deny policy, allow only the ports you need, and turn it on without locking out SSH.
UFW and IPv6: the open door on your VPS
Your UFW rules and cloud firewall may only cover IPv4, leaving services wide open on IPv6. See why it happens on a VPS and how to close the gap.