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// Other services

Port 3769: HAIPE Network Keying

Port 3769 is assigned by IANA to haipe-otnk (HAIPE Network Keying).

3769

How haipe-otnk works

Other services
client:3769haipe-otnkresponse client:3769haipe-otnkresponse

The client sends a request to port 3769 and the haipe-otnk 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 3769 dangerous?

We have no specific security note for port 3769. 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 3769

ServicePortTransportDescriptionReferenceUpdated
haipe-otnk 3769 TCP, UDP HAIPE Network Keying - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3769, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3769'      # process listening on 3769
sudo lsof -nP -i :3769

macOS

sudo lsof -nP -i :3769

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3769 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3769
netstat -ano | findstr :3769

From another machine

nmap -p 3769 -sV <host>
sudo nmap -sU -p 3769 <host>
nc -zv <host> 3769

Block it in the firewall

sudo ufw deny 3769/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3769" -Direction Inbound -LocalPort 3769 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3769 used for?

Port 3769 is assigned by IANA to haipe-otnk (HAIPE Network Keying).

Is port 3769 TCP or UDP?

Port 3769 is registered for TCP and UDP.

Is it safe to open port 3769?

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 3769 is open?

On Linux run "ss -ltnup 'sport = :3769'", on macOS "lsof -nP -i :3769", and on Windows "netstat -ano | findstr :3769" to see the local process. From another machine, "nmap -p 3769 <host>" shows whether it is reachable.

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