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// Other services

Port 4356: QSNet Assistant

Port 4356 is assigned by IANA to qsnet-assist (QSNet Assistant).

4356

How qsnet-assist works

Other services
client:4356qsnet-assistresponse client:4356qsnet-assistresponse

The client sends a request to port 4356 and the qsnet-assist service answers.

Transport
TCP · UDP
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 4356 dangerous?

We have no specific security note for port 4356. 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 4356

ServicePortTransportDescriptionReferenceUpdated
qsnet-assist 4356 TCP, UDP QSNet Assistant - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4356, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4356'      # process listening on 4356
sudo lsof -nP -i :4356

macOS

sudo lsof -nP -i :4356

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4356 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4356
netstat -ano | findstr :4356

From another machine

nmap -p 4356 -sV <host>
sudo nmap -sU -p 4356 <host>
nc -zv <host> 4356

Block it in the firewall

sudo ufw deny 4356/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4356" -Direction Inbound -LocalPort 4356 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4356 used for?

Port 4356 is assigned by IANA to qsnet-assist (QSNet Assistant).

Is port 4356 TCP or UDP?

Port 4356 is registered for TCP and UDP.

Is it safe to open port 4356?

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 4356 is open?

On Linux run "ss -ltnup 'sport = :4356'", on macOS "lsof -nP -i :4356", and on Windows "netstat -ano | findstr :4356" to see the local process. From another machine, "nmap -p 4356 <host>" shows whether it is reachable.

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