CyberHunter
Local dataset, no network
// Other services

Port 3622: FF LAN Redundancy Port

Port 3622 is assigned by IANA to ff-lr-port (FF LAN Redundancy Port).

3622

How ff-lr-port works

Other services
client:3622ff-lr-portresponse client:3622ff-lr-portresponse

The client sends a request to port 3622 and the ff-lr-port 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 3622 dangerous?

We have no specific security note for port 3622. 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 3622

ServicePortTransportDescriptionReferenceUpdated
ff-lr-port 3622 TCP, UDP FF LAN Redundancy Port - 2002-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3622, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3622'      # process listening on 3622
sudo lsof -nP -i :3622

macOS

sudo lsof -nP -i :3622

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3622 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3622
netstat -ano | findstr :3622

From another machine

nmap -p 3622 -sV <host>
sudo nmap -sU -p 3622 <host>
nc -zv <host> 3622

Block it in the firewall

sudo ufw deny 3622/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3622" -Direction Inbound -LocalPort 3622 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3622 used for?

Port 3622 is assigned by IANA to ff-lr-port (FF LAN Redundancy Port).

Is port 3622 TCP or UDP?

Port 3622 is registered for TCP and UDP.

Is it safe to open port 3622?

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 3622 is open?

On Linux run "ss -ltnup 'sport = :3622'", on macOS "lsof -nP -i :3622", and on Windows "netstat -ano | findstr :3622" to see the local process. From another machine, "nmap -p 3622 <host>" shows whether it is reachable.

05 Related
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