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// Other services

Port 3266: NS CFG Server

Port 3266 is assigned by IANA to ns-cfg-server (NS CFG Server).

3266

How ns-cfg-server works

Other services
client:3266ns-cfg-serverresponse client:3266ns-cfg-serverresponse

The client sends a request to port 3266 and the ns-cfg-server 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 3266 dangerous?

We have no specific security note for port 3266. 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 3266

ServicePortTransportDescriptionReferenceUpdated
ns-cfg-server 3266 TCP, UDP NS CFG Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3266, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3266'      # process listening on 3266
sudo lsof -nP -i :3266

macOS

sudo lsof -nP -i :3266

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3266 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3266
netstat -ano | findstr :3266

From another machine

nmap -p 3266 -sV <host>
sudo nmap -sU -p 3266 <host>
nc -zv <host> 3266

Block it in the firewall

sudo ufw deny 3266/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3266" -Direction Inbound -LocalPort 3266 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3266 used for?

Port 3266 is assigned by IANA to ns-cfg-server (NS CFG Server).

Is port 3266 TCP or UDP?

Port 3266 is registered for TCP and UDP.

Is it safe to open port 3266?

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 3266 is open?

On Linux run "ss -ltnup 'sport = :3266'", on macOS "lsof -nP -i :3266", and on Windows "netstat -ano | findstr :3266" to see the local process. From another machine, "nmap -p 3266 <host>" shows whether it is reachable.

05 Related
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