CyberHunter
Local dataset, no network
// Other services

Port 4355: QSNet Workstation

Port 4355 is assigned by IANA to qsnet-workst (QSNet Workstation).

4355

How qsnet-workst works

Other services
client:4355qsnet-workstresponse client:4355qsnet-workstresponse

The client sends a request to port 4355 and the qsnet-workst 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 4355 dangerous?

We have no specific security note for port 4355. 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 4355

ServicePortTransportDescriptionReferenceUpdated
qsnet-workst 4355 TCP, UDP QSNet Workstation - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4355, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4355'      # process listening on 4355
sudo lsof -nP -i :4355

macOS

sudo lsof -nP -i :4355

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4355 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4355
netstat -ano | findstr :4355

From another machine

nmap -p 4355 -sV <host>
sudo nmap -sU -p 4355 <host>
nc -zv <host> 4355

Block it in the firewall

sudo ufw deny 4355/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4355" -Direction Inbound -LocalPort 4355 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4355 used for?

Port 4355 is assigned by IANA to qsnet-workst (QSNet Workstation).

Is port 4355 TCP or UDP?

Port 4355 is registered for TCP and UDP.

Is it safe to open port 4355?

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 4355 is open?

On Linux run "ss -ltnup 'sport = :4355'", on macOS "lsof -nP -i :4355", and on Windows "netstat -ano | findstr :4355" to see the local process. From another machine, "nmap -p 4355 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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