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// Other services

Port 3017: Event Listener

Port 3017 is assigned by IANA to event_listener (Event Listener), event-listener (Event Listener IANA assigned this well-formed service name as a replacement for "event_listener".).

3017

How event_listener works

Other services
client:3017event_listenerresponse client:3017event_listenerresponse

The client sends a request to port 3017 and the event_listener service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3017 dangerous?

We have no specific security note for port 3017. 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 3017

ServicePortTransportDescriptionReferenceUpdated
event_listener 3017 TCP, UDP Event Listener - -
event-listener 3017 TCP, UDP Event Listener IANA assigned this well-formed service name as a replacement for "event_listener". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3017, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3017'      # process listening on 3017
sudo lsof -nP -i :3017

macOS

sudo lsof -nP -i :3017

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3017 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3017
netstat -ano | findstr :3017

From another machine

nmap -p 3017 -sV <host>
sudo nmap -sU -p 3017 <host>
nc -zv <host> 3017

Block it in the firewall

sudo ufw deny 3017/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3017" -Direction Inbound -LocalPort 3017 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3017 used for?

Port 3017 is assigned by IANA to event_listener (Event Listener), event-listener (Event Listener IANA assigned this well-formed service name as a replacement for "event_listener".).

Is port 3017 TCP or UDP?

Port 3017 is registered for TCP and UDP.

Is it safe to open port 3017?

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 3017 is open?

On Linux run "ss -ltnup 'sport = :3017'", on macOS "lsof -nP -i :3017", and on Windows "netstat -ano | findstr :3017" to see the local process. From another machine, "nmap -p 3017 <host>" shows whether it is reachable.

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