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// Other services

Port 3734: Synel Data Collection Port

Port 3734 is assigned by IANA to synel-data (Synel Data Collection Port).

3734

How synel-data works

Other services
client:3734synel-dataresponse client:3734synel-dataresponse

The client sends a request to port 3734 and the synel-data 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 3734 dangerous?

We have no specific security note for port 3734. 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 3734

ServicePortTransportDescriptionReferenceUpdated
synel-data 3734 TCP, UDP Synel Data Collection Port - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3734, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3734'      # process listening on 3734
sudo lsof -nP -i :3734

macOS

sudo lsof -nP -i :3734

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3734 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3734
netstat -ano | findstr :3734

From another machine

nmap -p 3734 -sV <host>
sudo nmap -sU -p 3734 <host>
nc -zv <host> 3734

Block it in the firewall

sudo ufw deny 3734/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3734" -Direction Inbound -LocalPort 3734 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3734 used for?

Port 3734 is assigned by IANA to synel-data (Synel Data Collection Port).

Is port 3734 TCP or UDP?

Port 3734 is registered for TCP and UDP.

Is it safe to open port 3734?

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 3734 is open?

On Linux run "ss -ltnup 'sport = :3734'", on macOS "lsof -nP -i :3734", and on Windows "netstat -ano | findstr :3734" to see the local process. From another machine, "nmap -p 3734 <host>" shows whether it is reachable.

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