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// Other services

Port 2689: FastLynx

Port 2689 is assigned by IANA to fastlynx (FastLynx).

2689

How fastlynx works

Other services
client:2689fastlynxresponse client:2689fastlynxresponse

The client sends a request to port 2689 and the fastlynx 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 2689 dangerous?

We have no specific security note for port 2689. 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 2689

ServicePortTransportDescriptionReferenceUpdated
fastlynx 2689 TCP, UDP FastLynx - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2689, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2689'      # process listening on 2689
sudo lsof -nP -i :2689

macOS

sudo lsof -nP -i :2689

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2689 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2689
netstat -ano | findstr :2689

From another machine

nmap -p 2689 -sV <host>
sudo nmap -sU -p 2689 <host>
nc -zv <host> 2689

Block it in the firewall

sudo ufw deny 2689/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2689" -Direction Inbound -LocalPort 2689 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2689 used for?

Port 2689 is assigned by IANA to fastlynx (FastLynx).

Is port 2689 TCP or UDP?

Port 2689 is registered for TCP and UDP.

Is it safe to open port 2689?

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 2689 is open?

On Linux run "ss -ltnup 'sport = :2689'", on macOS "lsof -nP -i :2689", and on Windows "netstat -ano | findstr :2689" to see the local process. From another machine, "nmap -p 2689 <host>" shows whether it is reachable.

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