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Port 3012 (twsdss)

IANA assigns port 3012 to twsdss: Trusted Web Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
twsdss TCP Trusted Web Client Alex Duncan -
twsdss UDP Trusted Web Client Alex Duncan -

Check what is listening on port 3012

Linux: is anything listening on TCP 3012?
sudo ss -tlnp 'sport = :3012'
Linux: UDP 3012
sudo ss -ulnp 'sport = :3012'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3012
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3012 '
Windows (Command Prompt)
netstat -ano | findstr :3012
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3012 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3012
From Windows
Test-NetConnection HOST -Port 3012
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3012

Block port 3012 in the firewall

ufw
sudo ufw deny 3012/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3012 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3012 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3012' -Direction Inbound -Protocol TCP -LocalPort 3012 -Action Block
ufw
sudo ufw deny 3012/udp
iptables
sudo iptables -A INPUT -p udp --dport 3012 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3012 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3012' -Direction Inbound -Protocol UDP -LocalPort 3012 -Action Block

Related ports

3010gw, ping-pong3011trusted-web3013gilatskysurfer3014broker-service, broker_service

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