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Port 2823 (cqg-netlan)

IANA assigns port 2823 to cqg-netlan: CQG Net/LAN.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cqg-netlan TCP CQG Net/LAN - -
cqg-netlan UDP CQG Net/LAN - -

Check what is listening on port 2823

Linux: is anything listening on TCP 2823?
sudo ss -tlnp 'sport = :2823'
Linux: UDP 2823
sudo ss -ulnp 'sport = :2823'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2823
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2823 '
Windows (Command Prompt)
netstat -ano | findstr :2823
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2823 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2823
From Windows
Test-NetConnection HOST -Port 2823
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2823

Block port 2823 in the firewall

ufw
sudo ufw deny 2823/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2823 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2823 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2823' -Direction Inbound -Protocol TCP -LocalPort 2823 -Action Block
ufw
sudo ufw deny 2823/udp
iptables
sudo iptables -A INPUT -p udp --dport 2823 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2823 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2823' -Direction Inbound -Protocol UDP -LocalPort 2823 -Action Block

Related ports

2821vrts-at-port2822ka0wuc2824cqg-netlan-12826slc-systemlog

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