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// Other services

Port 2109: Ergolight

Port 2109 is assigned by IANA to ergolight (Ergolight).

2109

How ergolight works

Other services
client:2109ergolightresponse client:2109ergolightresponse

The client sends a request to port 2109 and the ergolight 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 2109 dangerous?

We have no specific security note for port 2109. 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 2109

ServicePortTransportDescriptionReferenceUpdated
ergolight 2109 TCP, UDP Ergolight - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2109, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2109'      # process listening on 2109
sudo lsof -nP -i :2109

macOS

sudo lsof -nP -i :2109

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2109 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2109
netstat -ano | findstr :2109

From another machine

nmap -p 2109 -sV <host>
sudo nmap -sU -p 2109 <host>
nc -zv <host> 2109

Block it in the firewall

sudo ufw deny 2109/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2109" -Direction Inbound -LocalPort 2109 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2109 used for?

Port 2109 is assigned by IANA to ergolight (Ergolight).

Is port 2109 TCP or UDP?

Port 2109 is registered for TCP and UDP.

Is it safe to open port 2109?

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 2109 is open?

On Linux run "ss -ltnup 'sport = :2109'", on macOS "lsof -nP -i :2109", and on Windows "netstat -ano | findstr :2109" to see the local process. From another machine, "nmap -p 2109 <host>" shows whether it is reachable.

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