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// Other services

Port 3397: Cloanto License Manager

Port 3397 is assigned by IANA to cloanto-lm (Cloanto License Manager).

3397

How cloanto-lm works

Other services
client:3397cloanto-lmresponse client:3397cloanto-lmresponse

The client sends a request to port 3397 and the cloanto-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 3397 dangerous?

We have no specific security note for port 3397. 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 3397

ServicePortTransportDescriptionReferenceUpdated
cloanto-lm 3397 TCP, UDP Cloanto License Manager - 2010-04-30

// source: IANA service name and port number registry

03 Check it

Which program uses port 3397, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3397'      # process listening on 3397
sudo lsof -nP -i :3397

macOS

sudo lsof -nP -i :3397

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3397 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3397
netstat -ano | findstr :3397

From another machine

nmap -p 3397 -sV <host>
sudo nmap -sU -p 3397 <host>
nc -zv <host> 3397

Block it in the firewall

sudo ufw deny 3397/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3397" -Direction Inbound -LocalPort 3397 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3397 used for?

Port 3397 is assigned by IANA to cloanto-lm (Cloanto License Manager).

Is port 3397 TCP or UDP?

Port 3397 is registered for TCP and UDP.

Is it safe to open port 3397?

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 3397 is open?

On Linux run "ss -ltnup 'sport = :3397'", on macOS "lsof -nP -i :3397", and on Windows "netstat -ano | findstr :3397" to see the local process. From another machine, "nmap -p 3397 <host>" shows whether it is reachable.

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