firewall-configuration

Configure a UFW firewall on your VPS by installing UFW, setting default policies to deny incoming traffic, explicitly permitting SSH, and verifying rules to prevent lockouts. This restricts unwanted network access on Ubuntu/Debian servers.

Yes, you must allow SSH before enabling UFW default deny rules. Configuring a deny-by-default firewall without explicitly permitting SSH traffic will lock you out of your VPS server immediately upon firewall activation.

The best way to open ports for web services using UFW is to create application-specific rules after establishing default deny policies. This ensures only necessary services are exposed while maintaining server security during ongoing maintenance and audits.

Yes, UFW configuration supports both IPv4 and IPv6 traffic. Setting up default policies and application-specific rules applies the deny-by-default security posture across both protocols to fully restrict network access on your VPS.

Yes, you can use UFW for server hardening during security audits. It allows you to verify firewall status, validate active port rules, and ensure a strict deny-by-default posture is maintained across your VPS environment.

Your SSH connection drops after setting UFW default deny because the firewall blocks all incoming traffic by default. You must create an explicit rule to permit SSH before enabling UFW to prevent server lockouts.