CyberHunter
Local dataset, no network
// Other services

Port 3123: EDI Translation Protocol

Port 3123 is assigned by IANA to edix (EDI Translation Protocol).

3123

How edix works

Other services
client:3123edixresponse client:3123edixresponse

The client sends a request to port 3123 and the edix 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 3123 dangerous?

We have no specific security note for port 3123. 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 3123

ServicePortTransportDescriptionReferenceUpdated
edix 3123 TCP, UDP EDI Translation Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3123, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3123'      # process listening on 3123
sudo lsof -nP -i :3123

macOS

sudo lsof -nP -i :3123

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3123 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3123
netstat -ano | findstr :3123

From another machine

nmap -p 3123 -sV <host>
sudo nmap -sU -p 3123 <host>
nc -zv <host> 3123

Block it in the firewall

sudo ufw deny 3123/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3123" -Direction Inbound -LocalPort 3123 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3123 used for?

Port 3123 is assigned by IANA to edix (EDI Translation Protocol).

Is port 3123 TCP or UDP?

Port 3123 is registered for TCP and UDP.

Is it safe to open port 3123?

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 3123 is open?

On Linux run "ss -ltnup 'sport = :3123'", on macOS "lsof -nP -i :3123", and on Windows "netstat -ano | findstr :3123" to see the local process. From another machine, "nmap -p 3123 <host>" shows whether it is reachable.

05 Related
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