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Port 4802 (ilss)

IANA assigns port 4802 to ilss: Icona License System Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ilss TCP Icona License System Server Paul Stephen Borlie -
ilss UDP Icona License System Server Paul Stephen Borlie -

Check what is listening on port 4802

Linux: is anything listening on TCP 4802?
sudo ss -tlnp 'sport = :4802'
Linux: UDP 4802
sudo ss -ulnp 'sport = :4802'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4802
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4802 '
Windows (Command Prompt)
netstat -ano | findstr :4802
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4802 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4802
From Windows
Test-NetConnection HOST -Port 4802
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4802

Block port 4802 in the firewall

ufw
sudo ufw deny 4802/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4802 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4802 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4802' -Direction Inbound -Protocol TCP -LocalPort 4802 -Action Block
ufw
sudo ufw deny 4802/udp
iptables
sudo iptables -A INPUT -p udp --dport 4802 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4802 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4802' -Direction Inbound -Protocol UDP -LocalPort 4802 -Action Block

Related ports

4800iims4801iwec4803notateit, notateit-disc4804aja-ntv4-disc

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