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// Other services

Port 3471: jt400-ssl

Port 3471 is assigned by IANA to jt400-ssl (jt400-ssl).

3471

How jt400-ssl works

Other services
client:3471jt400-sslresponse client:3471jt400-sslresponse

The client sends a request to port 3471 and the jt400-ssl 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 3471 dangerous?

We have no specific security note for port 3471. 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 3471

ServicePortTransportDescriptionReferenceUpdated
jt400-ssl 3471 TCP, UDP jt400-ssl - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3471, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3471'      # process listening on 3471
sudo lsof -nP -i :3471

macOS

sudo lsof -nP -i :3471

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3471 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3471
netstat -ano | findstr :3471

From another machine

nmap -p 3471 -sV <host>
sudo nmap -sU -p 3471 <host>
nc -zv <host> 3471

Block it in the firewall

sudo ufw deny 3471/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3471" -Direction Inbound -LocalPort 3471 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3471 used for?

Port 3471 is assigned by IANA to jt400-ssl (jt400-ssl).

Is port 3471 TCP or UDP?

Port 3471 is registered for TCP and UDP.

Is it safe to open port 3471?

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 3471 is open?

On Linux run "ss -ltnup 'sport = :3471'", on macOS "lsof -nP -i :3471", and on Windows "netstat -ano | findstr :3471" to see the local process. From another machine, "nmap -p 3471 <host>" shows whether it is reachable.

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