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// Other services

Port 3373: Lavenir License Manager

Port 3373 is assigned by IANA to lavenir-lm (Lavenir License Manager).

3373

How lavenir-lm works

Other services
client:3373lavenir-lmresponse client:3373lavenir-lmresponse

The client sends a request to port 3373 and the lavenir-lm 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 3373 dangerous?

We have no specific security note for port 3373. 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 3373

ServicePortTransportDescriptionReferenceUpdated
lavenir-lm 3373 TCP, UDP Lavenir License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3373, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3373'      # process listening on 3373
sudo lsof -nP -i :3373

macOS

sudo lsof -nP -i :3373

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3373 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3373
netstat -ano | findstr :3373

From another machine

nmap -p 3373 -sV <host>
sudo nmap -sU -p 3373 <host>
nc -zv <host> 3373

Block it in the firewall

sudo ufw deny 3373/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3373" -Direction Inbound -LocalPort 3373 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3373 used for?

Port 3373 is assigned by IANA to lavenir-lm (Lavenir License Manager).

Is port 3373 TCP or UDP?

Port 3373 is registered for TCP and UDP.

Is it safe to open port 3373?

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 3373 is open?

On Linux run "ss -ltnup 'sport = :3373'", on macOS "lsof -nP -i :3373", and on Windows "netstat -ano | findstr :3373" to see the local process. From another machine, "nmap -p 3373 <host>" shows whether it is reachable.

05 Related
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