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// Other services

Port 4369: Erlang Port Mapper Daemon

Port 4369 is assigned by IANA to epmd (Erlang Port Mapper Daemon).

4369

How epmd works

Other services
client:4369epmdresponse client:4369epmdresponse

The client sends a request to port 4369 and the epmd 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 4369 dangerous?

We have no specific security note for port 4369. 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 4369

ServicePortTransportDescriptionReferenceUpdated
epmd 4369 TCP, UDP Erlang Port Mapper Daemon - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4369, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4369'      # process listening on 4369
sudo lsof -nP -i :4369

macOS

sudo lsof -nP -i :4369

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4369 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4369
netstat -ano | findstr :4369

From another machine

nmap -p 4369 -sV <host>
sudo nmap -sU -p 4369 <host>
nc -zv <host> 4369

Block it in the firewall

sudo ufw deny 4369/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4369" -Direction Inbound -LocalPort 4369 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4369 used for?

Port 4369 is assigned by IANA to epmd (Erlang Port Mapper Daemon).

Is port 4369 TCP or UDP?

Port 4369 is registered for TCP and UDP.

Is it safe to open port 4369?

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 4369 is open?

On Linux run "ss -ltnup 'sport = :4369'", on macOS "lsof -nP -i :4369", and on Windows "netstat -ano | findstr :4369" to see the local process. From another machine, "nmap -p 4369 <host>" shows whether it is reachable.

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