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Port 12300 (linogridengine)

IANA assigns port 12300 to linogridengine: LinoGrid Engine.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
linogridengine TCP LinoGrid Engine Frans Lundberg -
linogridengine UDP LinoGrid Engine Frans Lundberg -

Registry dates for this port: registered 2004-11.

Check what is listening on port 12300

Linux: is anything listening on TCP 12300?
sudo ss -tlnp 'sport = :12300'
Linux: UDP 12300
sudo ss -ulnp 'sport = :12300'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12300
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12300 '
Windows (Command Prompt)
netstat -ano | findstr :12300
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12300 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12300
From Windows
Test-NetConnection HOST -Port 12300
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12300

Block port 12300 in the firewall

ufw
sudo ufw deny 12300/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12300 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12300 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12300' -Direction Inbound -Protocol TCP -LocalPort 12300 -Action Block
ufw
sudo ufw deny 12300/udp
iptables
sudo iptables -A INPUT -p udp --dport 12300 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12300 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12300' -Direction Inbound -Protocol UDP -LocalPort 12300 -Action Block

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