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Port 4134 (nifty-hmi)

IANA assigns port 4134 to nifty-hmi: NIFTY-Serve HMI protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nifty-hmi TCP NIFTY-Serve HMI protocol Ryuichi Suzuki -
nifty-hmi UDP NIFTY-Serve HMI protocol Ryuichi Suzuki -

Check what is listening on port 4134

Linux: is anything listening on TCP 4134?
sudo ss -tlnp 'sport = :4134'
Linux: UDP 4134
sudo ss -ulnp 'sport = :4134'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4134
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4134 '
Windows (Command Prompt)
netstat -ano | findstr :4134
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4134 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4134
From Windows
Test-NetConnection HOST -Port 4134
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4134

Block port 4134 in the firewall

ufw
sudo ufw deny 4134/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4134 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4134 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4134' -Direction Inbound -Protocol TCP -LocalPort 4134 -Action Block
ufw
sudo ufw deny 4134/udp
iptables
sudo iptables -A INPUT -p udp --dport 4134 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4134 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4134' -Direction Inbound -Protocol UDP -LocalPort 4134 -Action Block

Related ports

4132nuts-dem, nuts_dem4133nuts-bootp, nuts_bootp4135cl-db-attach4136cl-db-request

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