HTTPfy

Port 2378 (dali)

IANA assigns port 2378 to dali: DALI lighting control.

Registered (user) port, 1024-49151 UDP

Port 2378 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
dali UDP DALI lighting control DALI Alliance DiiA -

Registry dates for this port: registered 2020-11-24.

Check what is listening on port 2378

Linux: UDP 2378
sudo ss -ulnp 'sport = :2378'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2378
Windows (Command Prompt)
netstat -ano | findstr :2378
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 2378

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2378

Block port 2378 in the firewall

ufw
sudo ufw deny 2378/udp
iptables
sudo iptables -A INPUT -p udp --dport 2378 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2378 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2378' -Direction Inbound -Protocol UDP -LocalPort 2378 -Action Block

Related ports

2376Docker API (TLS)2377Docker Swarm management2379etcd client2380etcd peer

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