Port 3478 · STUN / TURN

Port 3478 is STUN / TURN, TCP and UDP.

Session Traversal Utilities for NAT — used by Teams, Zoom, and WebRTC to punch through NAT for media traffic.

Palo Alto

Create the service objects 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 tcp-3478 protocol tcp port 3478
set service udp-3478 protocol udp port 3478

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application stun service [ tcp-3478 udp-3478 ] action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -tlnp | grep :3478
• Linux ss -ulnp | grep :3478
• PowerShell Test-NetConnection <host> -Port 3478
• nmap nmap -p 3478 <host>
• nmap nmap -sU -p 3478 <host>

Related ports

• 443 HTTPS
• 5004 RTP / SRTP
• 4500 IPSec NAT Traversal
• 32400 Plex Media Server
• 5060 SIP
• 5061 SIP TLS

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