HTTPfy

Port 3471 (jt400-ssl)

IANA assigns port 3471 to jt400-ssl.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jt400-ssl TCP jt400-ssl Clifton Nock -
jt400-ssl UDP jt400-ssl Clifton Nock -

Check what is listening on port 3471

Linux: is anything listening on TCP 3471?
sudo ss -tlnp 'sport = :3471'
Linux: UDP 3471
sudo ss -ulnp 'sport = :3471'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3471
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3471 '
Windows (Command Prompt)
netstat -ano | findstr :3471
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3471 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3471
From Windows
Test-NetConnection HOST -Port 3471
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3471

Block port 3471 in the firewall

ufw
sudo ufw deny 3471/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3471 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3471 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3471' -Direction Inbound -Protocol TCP -LocalPort 3471 -Action Block
ufw
sudo ufw deny 3471/udp
iptables
sudo iptables -A INPUT -p udp --dport 3471 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3471 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3471' -Direction Inbound -Protocol UDP -LocalPort 3471 -Action Block

Related ports

3469pluribus3470jt4003472jaugsremotec-13473jaugsremotec-2

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