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// Other services

Port 6102: SynchroNet-upd

Port 6102 is assigned by IANA to synchronet-upd (SynchroNet-upd).

6102

How synchronet-upd works

Other services
client:6102synchronet-updresponse client:6102synchronet-updresponse

The client sends a request to port 6102 and the synchronet-upd 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 6102 dangerous?

We have no specific security note for port 6102. 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 6102

ServicePortTransportDescriptionReferenceUpdated
synchronet-upd 6102 TCP, UDP SynchroNet-upd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6102, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6102'      # process listening on 6102
sudo lsof -nP -i :6102

macOS

sudo lsof -nP -i :6102

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6102 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6102
netstat -ano | findstr :6102

From another machine

nmap -p 6102 -sV <host>
sudo nmap -sU -p 6102 <host>
nc -zv <host> 6102

Block it in the firewall

sudo ufw deny 6102/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6102" -Direction Inbound -LocalPort 6102 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6102 used for?

Port 6102 is assigned by IANA to synchronet-upd (SynchroNet-upd).

Is port 6102 TCP or UDP?

Port 6102 is registered for TCP and UDP.

Is it safe to open port 6102?

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 6102 is open?

On Linux run "ss -ltnup 'sport = :6102'", on macOS "lsof -nP -i :6102", and on Windows "netstat -ano | findstr :6102" to see the local process. From another machine, "nmap -p 6102 <host>" shows whether it is reachable.

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