Registered · Cross-platform

3702 WS-Discovery

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

Web Services Dynamic Discovery (used by ONVIF cameras, printers, Windows).

When / why

Device discovery. Block multicast at the edge — amplification risk.

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.
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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 3702

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

⚠ UDP amplification risk — restrict or disable on internet-facing interfaces.

ufw

sudo ufw allow proto tcp from <source> to any port 3702

Allow TCP 3702 (WS-Discovery). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 3702

Allow UDP 3702 (WS-Discovery). 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="3702" protocol="tcp" accept'

Allow TCP 3702 (WS-Discovery) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="3702" protocol="udp" accept'

Allow UDP 3702 (WS-Discovery) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 3702 accept

Allow TCP 3702 (WS-Discovery). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 3702 accept

Allow UDP 3702 (WS-Discovery). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 3702 -j ACCEPT

Allow TCP 3702 (WS-Discovery). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 3702 -j ACCEPT

Allow UDP 3702 (WS-Discovery). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-wsdiscovery-3702 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 3702

Inbound rule for 3702 (WS-Discovery). 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=3702,ToPort=3702,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 3702 (WS-Discovery). 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=3702,ToPort=3702,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 3702 (WS-Discovery). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-wsdiscovery-3702 --direction=INGRESS --action=ALLOW --rules=tcp:3702,udp:3702 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 3702 (WS-Discovery). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow WS-Discovery 3702/TCP" dir=in action=allow protocol=TCP localport=3702 remoteip=<source>

Inbound TCP 3702 (WS-Discovery). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow WS-Discovery 3702/UDP" dir=in action=allow protocol=UDP localport=3702 remoteip=<source>

Inbound UDP 3702 (WS-Discovery). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow WS-Discovery 3702/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 3702 -RemoteAddress <source>

Inbound TCP 3702 (WS-Discovery). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow WS-Discovery 3702/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 3702 -RemoteAddress <source>

Inbound UDP 3702 (WS-Discovery). 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.