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// Other services

Port 4168: PrintSoft License Server

Port 4168 is assigned by IANA to pslicser (PrintSoft License Server).

4168

How pslicser works

Other services
client:4168pslicserresponse client:4168pslicserresponse

The client sends a request to port 4168 and the pslicser 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 4168 dangerous?

We have no specific security note for port 4168. 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 4168

ServicePortTransportDescriptionReferenceUpdated
pslicser 4168 TCP, UDP PrintSoft License Server - 2007-09-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 4168, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4168'      # process listening on 4168
sudo lsof -nP -i :4168

macOS

sudo lsof -nP -i :4168

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4168 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4168
netstat -ano | findstr :4168

From another machine

nmap -p 4168 -sV <host>
sudo nmap -sU -p 4168 <host>
nc -zv <host> 4168

Block it in the firewall

sudo ufw deny 4168/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4168" -Direction Inbound -LocalPort 4168 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4168 used for?

Port 4168 is assigned by IANA to pslicser (PrintSoft License Server).

Is port 4168 TCP or UDP?

Port 4168 is registered for TCP and UDP.

Is it safe to open port 4168?

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 4168 is open?

On Linux run "ss -ltnup 'sport = :4168'", on macOS "lsof -nP -i :4168", and on Windows "netstat -ano | findstr :4168" to see the local process. From another machine, "nmap -p 4168 <host>" shows whether it is reachable.

05 Related
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