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// Other services

Port 6678: Viscount Freedom Bridge Protocol

Port 6678 is assigned by IANA to vfbp (Viscount Freedom Bridge Protocol), vfbp-disc (Viscount Freedom Bridge Discovery).

6678

How vfbp works

Other services
client:6678vfbpresponse client:6678vfbpresponse

The client sends a request to port 6678 and the vfbp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 6678 dangerous?

We have no specific security note for port 6678. 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 6678

ServicePortTransportDescriptionReferenceUpdated
vfbp 6678 TCP Viscount Freedom Bridge Protocol - 2011-03-16
vfbp-disc 6678 UDP Viscount Freedom Bridge Discovery - 2011-03-16

// source: IANA service name and port number registry

03 Check it

Which program uses port 6678, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6678'      # process listening on 6678
sudo lsof -nP -i :6678

macOS

sudo lsof -nP -i :6678

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6678 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6678
netstat -ano | findstr :6678

From another machine

nmap -p 6678 -sV <host>
sudo nmap -sU -p 6678 <host>
nc -zv <host> 6678

Block it in the firewall

sudo ufw deny 6678/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6678" -Direction Inbound -LocalPort 6678 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6678 used for?

Port 6678 is assigned by IANA to vfbp (Viscount Freedom Bridge Protocol), vfbp-disc (Viscount Freedom Bridge Discovery).

Is port 6678 TCP or UDP?

Port 6678 is registered for TCP and UDP.

Is it safe to open port 6678?

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 6678 is open?

On Linux run "ss -ltnup 'sport = :6678'", on macOS "lsof -nP -i :6678", and on Windows "netstat -ano | findstr :6678" to see the local process. From another machine, "nmap -p 6678 <host>" shows whether it is reachable.

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