Registered · Cross-platform

3478 STUN / TURN

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

NAT traversal for VoIP/WebRTC (STUN, TURN, Teams).

When / why

Real-time media (Teams, WebRTC). Open TCP and UDP for reliable media.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP Yes Assigned by IANA and standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
« 3389 RDP 3479 PlayStation Network »

Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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Firewall rules for port 3478

Copy-ready inbound rules for the active transports. Replace every <source> placeholder with the specific host, subnet, or CIDR that should reach this port.

ufw

sudo ufw allow proto tcp from <source> to any port 3478

Allow TCP 3478 (STUN / TURN). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 3478

Allow UDP 3478 (STUN / TURN). Replace <source> with the network/host that should reach it.

firewalld

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="3478" protocol="tcp" accept'

Allow TCP 3478 (STUN / TURN) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="3478" protocol="udp" accept'

Allow UDP 3478 (STUN / TURN) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 3478 accept

Allow TCP 3478 (STUN / TURN). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 3478 accept

Allow UDP 3478 (STUN / TURN). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 3478 -j ACCEPT

Allow TCP 3478 (STUN / TURN). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 3478 -j ACCEPT

Allow UDP 3478 (STUN / TURN). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-stunturn-3478 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 3478

Inbound rule for 3478 (STUN / TURN). Set <source> to a CIDR; lower priority number = higher precedence.

AWS Security Group

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=tcp,FromPort=3478,ToPort=3478,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 3478 (STUN / TURN). Replace <source-cidr> (e.g. 10.0.0.0/16).

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=udp,FromPort=3478,ToPort=3478,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 3478 (STUN / TURN). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-stunturn-3478 --direction=INGRESS --action=ALLOW --rules=tcp:3478,udp:3478 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 3478 (STUN / TURN). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow STUN / TURN 3478/TCP" dir=in action=allow protocol=TCP localport=3478 remoteip=<source>

Inbound TCP 3478 (STUN / TURN). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow STUN / TURN 3478/UDP" dir=in action=allow protocol=UDP localport=3478 remoteip=<source>

Inbound UDP 3478 (STUN / TURN). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow STUN / TURN 3478/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 3478 -RemoteAddress <source>

Inbound TCP 3478 (STUN / TURN). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow STUN / TURN 3478/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 3478 -RemoteAddress <source>

Inbound UDP 3478 (STUN / TURN). Replace <source> with a host or subnet.

Rules are generated only for transports marked active for this port. They default to an inbound allow with an explicit source placeholder — never any. Review direction, scope, and rule precedence before applying in production.