Port 69 (UDP) — TFTP

Trivial File Transfer Protocol, used for PXE boot and network devices.

🔒 Runs locally — your input never leaves this browser tab

No authentication. Keep on isolated networks.

Check if port 69 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':69 '

From another machine, test reachability:

nc -zv your-server.example.com 69

With UFW (Ubuntu/Debian):

sudo ufw deny 69

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=69/udp && sudo firewall-cmd --reload