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// Other services

Port 9400: Samsung Twain for Network Server

Port 9400 is assigned by IANA to sec-t4net-srv (Samsung Twain for Network Server).

9400

How sec-t4net-srv works

Other services
client:9400sec-t4net-srvresponse client:9400sec-t4net-srvresponse

The client sends a request to port 9400 and the sec-t4net-srv 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 9400 dangerous?

We have no specific security note for port 9400. 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 9400

ServicePortTransportDescriptionReferenceUpdated
sec-t4net-srv 9400 TCP, UDP Samsung Twain for Network Server - 2007-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 9400, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9400'      # process listening on 9400
sudo lsof -nP -i :9400

macOS

sudo lsof -nP -i :9400

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9400 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9400
netstat -ano | findstr :9400

From another machine

nmap -p 9400 -sV <host>
sudo nmap -sU -p 9400 <host>
nc -zv <host> 9400

Block it in the firewall

sudo ufw deny 9400/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9400" -Direction Inbound -LocalPort 9400 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9400 used for?

Port 9400 is assigned by IANA to sec-t4net-srv (Samsung Twain for Network Server).

Is port 9400 TCP or UDP?

Port 9400 is registered for TCP and UDP.

Is it safe to open port 9400?

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 9400 is open?

On Linux run "ss -ltnup 'sport = :9400'", on macOS "lsof -nP -i :9400", and on Windows "netstat -ano | findstr :9400" to see the local process. From another machine, "nmap -p 9400 <host>" shows whether it is reachable.

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