Port 3478: STUN/TURN
Port 3478 is STUN and TURN, the protocols that help two devices behind NAT establish a direct connection for real-time voice, video, or WebRTC data. When a direct connection cannot be made, a TURN server on this port relays the media instead.
| Port number | 3478 |
|---|---|
| Service | STUN/TURN (NAT traversal for WebRTC) |
| Protocol | TCP/UDP |
| Category | Proxy & tunneling |
| Default encryption | No |
Frequently asked questions
What is port 3478 used for?
Port 3478 is STUN and TURN, the protocols that help two devices behind NAT establish a direct connection for real-time voice, video, or WebRTC data. When a direct connection cannot be made, a TURN server on this port relays the media instead.
Is port 3478 TCP or UDP?
Port 3478 (STUN/TURN) uses TCP/UDP.
Is port 3478 secure?
Port 3478 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 3478 on my firewall?
Only if you specifically need STUN/TURN. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.