CyberHunter
Local dataset, no network
// Other services

Port 3697: NavisWorks License System

Port 3697 is assigned by IANA to nw-license (NavisWorks License System).

3697

How nw-license works

Other services
client:3697nw-licenseresponse client:3697nw-licenseresponse

The client sends a request to port 3697 and the nw-license 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 3697 dangerous?

We have no specific security note for port 3697. 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 3697

ServicePortTransportDescriptionReferenceUpdated
nw-license 3697 TCP, UDP NavisWorks License System - 2003-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3697, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3697'      # process listening on 3697
sudo lsof -nP -i :3697

macOS

sudo lsof -nP -i :3697

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3697 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3697
netstat -ano | findstr :3697

From another machine

nmap -p 3697 -sV <host>
sudo nmap -sU -p 3697 <host>
nc -zv <host> 3697

Block it in the firewall

sudo ufw deny 3697/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3697" -Direction Inbound -LocalPort 3697 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3697 used for?

Port 3697 is assigned by IANA to nw-license (NavisWorks License System).

Is port 3697 TCP or UDP?

Port 3697 is registered for TCP and UDP.

Is it safe to open port 3697?

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 3697 is open?

On Linux run "ss -ltnup 'sport = :3697'", on macOS "lsof -nP -i :3697", and on Windows "netstat -ano | findstr :3697" to see the local process. From another machine, "nmap -p 3697 <host>" shows whether it is reachable.

05 Related
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