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// Other services

Port 9401: Samsung Twain for Network Client

Port 9401 is assigned by IANA to sec-t4net-clt (Samsung Twain for Network Client).

9401

How sec-t4net-clt works

Other services
client:9401sec-t4net-cltresponse client:9401sec-t4net-cltresponse

The client sends a request to port 9401 and the sec-t4net-clt 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 9401 dangerous?

We have no specific security note for port 9401. 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 9401

ServicePortTransportDescriptionReferenceUpdated
sec-t4net-clt 9401 TCP, UDP Samsung Twain for Network Client - 2007-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 9401, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9401'      # process listening on 9401
sudo lsof -nP -i :9401

macOS

sudo lsof -nP -i :9401

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9401 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9401
netstat -ano | findstr :9401

From another machine

nmap -p 9401 -sV <host>
sudo nmap -sU -p 9401 <host>
nc -zv <host> 9401

Block it in the firewall

sudo ufw deny 9401/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9401" -Direction Inbound -LocalPort 9401 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9401 used for?

Port 9401 is assigned by IANA to sec-t4net-clt (Samsung Twain for Network Client).

Is port 9401 TCP or UDP?

Port 9401 is registered for TCP and UDP.

Is it safe to open port 9401?

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 9401 is open?

On Linux run "ss -ltnup 'sport = :9401'", on macOS "lsof -nP -i :9401", and on Windows "netstat -ano | findstr :9401" to see the local process. From another machine, "nmap -p 9401 <host>" shows whether it is reachable.

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