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Port 2974 (signal)

IANA assigns port 2974 to signal: Signal.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
signal TCP Signal Wyatt Williams -
signal UDP Signal Wyatt Williams -

Check what is listening on port 2974

Linux: is anything listening on TCP 2974?
sudo ss -tlnp 'sport = :2974'
Linux: UDP 2974
sudo ss -ulnp 'sport = :2974'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2974
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2974 '
Windows (Command Prompt)
netstat -ano | findstr :2974
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2974 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2974
From Windows
Test-NetConnection HOST -Port 2974
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2974

Block port 2974 in the firewall

ufw
sudo ufw deny 2974/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2974 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2974 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2974' -Direction Inbound -Protocol TCP -LocalPort 2974 -Action Block
ufw
sudo ufw deny 2974/udp
iptables
sudo iptables -A INPUT -p udp --dport 2974 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2974 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2974' -Direction Inbound -Protocol UDP -LocalPort 2974 -Action Block

Related ports

2972pmsm-webrctl2973svnetworks2975fjmpcm2976cns-srv-port

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