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// Other services

Port 6440: heliosd daemon

Port 6440 is assigned by IANA to heliosd (heliosd daemon).

6440

How heliosd works

Other services
client:6440heliosdresponse client:6440heliosdresponse

The client sends a request to port 6440 and the heliosd service answers.

Transport
TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 6440 dangerous?

We have no specific security note for port 6440. 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 6440

ServicePortTransportDescriptionReferenceUpdated
heliosd 6440 TCP heliosd daemon - 2020-02-28
-6440-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6440, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6440'      # process listening on 6440
sudo lsof -nP -i :6440

macOS

sudo lsof -nP -i :6440

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6440 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6440
netstat -ano | findstr :6440

From another machine

nmap -p 6440 -sV <host>
nc -zv <host> 6440

Block it in the firewall

sudo ufw deny 6440/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6440" -Direction Inbound -LocalPort 6440 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6440 used for?

Port 6440 is assigned by IANA to heliosd (heliosd daemon).

Is port 6440 TCP or UDP?

Port 6440 is registered for TCP.

Is it safe to open port 6440?

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 6440 is open?

On Linux run "ss -ltnup 'sport = :6440'", on macOS "lsof -nP -i :6440", and on Windows "netstat -ano | findstr :6440" to see the local process. From another machine, "nmap -p 6440 <host>" shows whether it is reachable.

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