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// Other services

Port 4159: Network Security Service

Port 4159 is assigned by IANA to nss (Network Security Service).

4159

How nss works

Other services
client:4159nssresponse client:4159nssresponse

The client sends a request to port 4159 and the nss 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 4159 dangerous?

We have no specific security note for port 4159. 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 4159

ServicePortTransportDescriptionReferenceUpdated
nss 4159 TCP, UDP Network Security Service - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4159, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4159'      # process listening on 4159
sudo lsof -nP -i :4159

macOS

sudo lsof -nP -i :4159

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4159 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4159
netstat -ano | findstr :4159

From another machine

nmap -p 4159 -sV <host>
sudo nmap -sU -p 4159 <host>
nc -zv <host> 4159

Block it in the firewall

sudo ufw deny 4159/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4159" -Direction Inbound -LocalPort 4159 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4159 used for?

Port 4159 is assigned by IANA to nss (Network Security Service).

Is port 4159 TCP or UDP?

Port 4159 is registered for TCP and UDP.

Is it safe to open port 4159?

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 4159 is open?

On Linux run "ss -ltnup 'sport = :4159'", on macOS "lsof -nP -i :4159", and on Windows "netstat -ano | findstr :4159" to see the local process. From another machine, "nmap -p 4159 <host>" shows whether it is reachable.

05 Related
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