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Port 6268 (grid)

IANA assigns port 6268 to grid: Grid Authentication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
grid TCP Grid Authentication Jason Hamilton -
grid UDP Grid Authentication Jason Hamilton -

Registry dates for this port: registered 2006-06.

Check what is listening on port 6268

Linux: is anything listening on TCP 6268?
sudo ss -tlnp 'sport = :6268'
Linux: UDP 6268
sudo ss -ulnp 'sport = :6268'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6268
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6268 '
Windows (Command Prompt)
netstat -ano | findstr :6268
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6268 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6268
From Windows
Test-NetConnection HOST -Port 6268
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6268

Block port 6268 in the firewall

ufw
sudo ufw deny 6268/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6268 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6268 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6268' -Direction Inbound -Protocol TCP -LocalPort 6268 -Action Block
ufw
sudo ufw deny 6268/udp
iptables
sudo iptables -A INPUT -p udp --dport 6268 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6268 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6268' -Direction Inbound -Protocol UDP -LocalPort 6268 -Action Block

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