Port 69: TFTP
Port 69 is TFTP, a stripped-down file transfer used to load firmware, boot images, and switch configs. It has no authentication, so it is kept to trusted management networks.
UDPFile transferUnencrypted by defaultIANA assigned
| Port number | 69 |
|---|---|
| Service | Trivial File Transfer Protocol |
| Protocol | UDP |
| Category | File transfer |
| Default encryption | No |
Security note. Port 69 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 69 used for?
Port 69 is TFTP, a stripped-down file transfer used to load firmware, boot images, and switch configs. It has no authentication, so it is kept to trusted management networks.
Is port 69 TCP or UDP?
Port 69 (TFTP) uses UDP.
Is port 69 secure?
Port 69 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 69 on my firewall?
Only if you specifically need TFTP. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.