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UFW Firewall

  1. Install with:
    apt update
    sudo apt install ufw
  2. Check preset profiles and allow necessary services as root:
    sudo ufw app list
    sudo ufw allow OpenSSH
    sudo ufw allow "Apache Full"
    sudo ufw allow Samba
    sudo ufw allow 1194 # OpenVPN
    sudo ufw allow 3493 # NUT
  3. Enable firewall and check status:
    ufw enable
    sudo ufw status
  4. Remove firewall rule:
    sudo ufw status numbered
    sudo ufw delete <rule number>