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Port 3717 (wv-csp-udp-cir)

IANA assigns port 3717 to wv-csp-udp-cir: WV CSP UDP/IP CIR Channel.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wv-csp-udp-cir TCP WV CSP UDP/IP CIR Channel Jon Ingi Ingimundars -
wv-csp-udp-cir UDP WV CSP UDP/IP CIR Channel Jon Ingi Ingimundars -

Registry dates for this port: registered 2003-03.

Check what is listening on port 3717

Linux: is anything listening on TCP 3717?
sudo ss -tlnp 'sport = :3717'
Linux: UDP 3717
sudo ss -ulnp 'sport = :3717'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3717
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3717 '
Windows (Command Prompt)
netstat -ano | findstr :3717
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3717 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3717
From Windows
Test-NetConnection HOST -Port 3717
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3717

Block port 3717 in the firewall

ufw
sudo ufw deny 3717/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3717 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3717 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3717' -Direction Inbound -Protocol TCP -LocalPort 3717 -Action Block
ufw
sudo ufw deny 3717/udp
iptables
sudo iptables -A INPUT -p udp --dport 3717 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3717 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3717' -Direction Inbound -Protocol UDP -LocalPort 3717 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.