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Port 1802 (concomp1)

IANA assigns port 1802 to concomp1: ConComp1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
concomp1 TCP ConComp1 Ed Vincent -
concomp1 UDP ConComp1 Ed Vincent -

Check what is listening on port 1802

Linux: is anything listening on TCP 1802?
sudo ss -tlnp 'sport = :1802'
Linux: UDP 1802
sudo ss -ulnp 'sport = :1802'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1802
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1802 '
Windows (Command Prompt)
netstat -ano | findstr :1802
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1802 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1802
From Windows
Test-NetConnection HOST -Port 1802
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1802

Block port 1802 in the firewall

ufw
sudo ufw deny 1802/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1802 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1802 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1802' -Direction Inbound -Protocol TCP -LocalPort 1802 -Action Block
ufw
sudo ufw deny 1802/udp
iptables
sudo iptables -A INPUT -p udp --dport 1802 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1802 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1802' -Direction Inbound -Protocol UDP -LocalPort 1802 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.