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// Other services

Port 6444: Grid Engine Qmaster Service

Port 6444 is assigned by IANA to sge_qmaster (Grid Engine Qmaster Service), sge-qmaster (Grid Engine Qmaster Service IANA assigned this well-formed service name as a replacement for "sge_qmaster".).

6444

How sge_qmaster works

Other services
client:6444sge_qmasterresponse client:6444sge_qmasterresponse

The client sends a request to port 6444 and the sge_qmaster service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 6444 dangerous?

We have no specific security note for port 6444. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 6444

ServicePortTransportDescriptionReferenceUpdated
sge_qmaster 6444 TCP, UDP Grid Engine Qmaster Service - 2006-08
sge-qmaster 6444 TCP, UDP Grid Engine Qmaster Service IANA assigned this well-formed service name as a replacement for "sge_qmaster". - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 6444, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6444'      # process listening on 6444
sudo lsof -nP -i :6444

macOS

sudo lsof -nP -i :6444

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6444 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6444
netstat -ano | findstr :6444

From another machine

nmap -p 6444 -sV <host>
sudo nmap -sU -p 6444 <host>
nc -zv <host> 6444

Block it in the firewall

sudo ufw deny 6444/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6444" -Direction Inbound -LocalPort 6444 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6444 used for?

Port 6444 is assigned by IANA to sge_qmaster (Grid Engine Qmaster Service), sge-qmaster (Grid Engine Qmaster Service IANA assigned this well-formed service name as a replacement for "sge_qmaster".).

Is port 6444 TCP or UDP?

Port 6444 is registered for TCP and UDP.

Is it safe to open port 6444?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 6444 is open?

On Linux run "ss -ltnup 'sport = :6444'", on macOS "lsof -nP -i :6444", and on Windows "netstat -ano | findstr :6444" to see the local process. From another machine, "nmap -p 6444 <host>" shows whether it is reachable.

05 Related
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