Port 6444 (sge-qmaster, sge_qmaster)

IANA assigns port 6444 to sge-qmaster, sge_qmaster: Grid Engine Qmaster Service IANA assigned this well-formed service name as a replacement for "sge_qmaster"..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

sge-qmaster TCP Grid Engine Qmaster Service IANA assigned this well-formed service name as a replacement for "sge_qmaster". Andreas Haas -

sge_qmaster TCP Grid Engine Qmaster Service
This entry is an alias to "sge-qmaster". This entry is now historic, not usable for use with many common service discovery mechanisms. Andreas Haas -

sge-qmaster UDP Grid Engine Qmaster Service IANA assigned this well-formed service name as a replacement for "sge_qmaster". Andreas Haas -

sge_qmaster UDP Grid Engine Qmaster Service
This entry is an alias to "sge-qmaster". This entry is now historic, not usable for use with many common service discovery mechanisms. Andreas Haas -

Registry dates for this port: registered 2006-08.

Check what is listening on port 6444

Linux: is anything listening on TCP 6444?

sudo ss -tlnp 'sport = :6444'

Linux: UDP 6444

sudo ss -ulnp 'sport = :6444'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6444

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6444 '

Windows (Command Prompt)

netstat -ano | findstr :6444

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6444 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 6444

From Windows

Test-NetConnection HOST -Port 6444

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 6444

Block port 6444 in the firewall

ufw

sudo ufw deny 6444/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6444 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6444 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6444' -Direction Inbound -Protocol TCP -LocalPort 6444 -Action Block

ufw

sudo ufw deny 6444/udp