Port 69 · TFTP

Port 69 is TFTP, UDP.

Trivial File Transfer Protocol — unauthenticated. Used for PXE boot, network device IOS/firmware, and config transfer.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service udp-69 protocol udp port 69

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application tftp service udp-69 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -ulnp | grep :69
• nmap nmap -sU -p 69 <host>

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• 49 TACACS+
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