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Port 2417 (composit-server)

IANA assigns port 2417 to composit-server: Composit Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
composit-server TCP Composit Server Katsuaki Naoi -
composit-server UDP Composit Server Katsuaki Naoi -

Check what is listening on port 2417

Linux: is anything listening on TCP 2417?
sudo ss -tlnp 'sport = :2417'
Linux: UDP 2417
sudo ss -ulnp 'sport = :2417'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2417
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2417 '
Windows (Command Prompt)
netstat -ano | findstr :2417
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2417 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2417
From Windows
Test-NetConnection HOST -Port 2417
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2417

Block port 2417 in the firewall

ufw
sudo ufw deny 2417/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2417 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2417 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2417' -Direction Inbound -Protocol TCP -LocalPort 2417 -Action Block
ufw
sudo ufw deny 2417/udp
iptables
sudo iptables -A INPUT -p udp --dport 2417 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2417 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2417' -Direction Inbound -Protocol UDP -LocalPort 2417 -Action Block

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