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Port 6678 (vfbp, vfbp-disc)

IANA assigns port 6678 to vfbp, vfbp-disc: Viscount Freedom Bridge Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vfbp TCP Viscount Freedom Bridge Protocol Chris MacDonald -
vfbp-disc UDP Viscount Freedom Bridge Discovery Chris MacDonald -

Registry dates for this port: registered 2011-03-16.

Check what is listening on port 6678

Linux: is anything listening on TCP 6678?
sudo ss -tlnp 'sport = :6678'
Linux: UDP 6678
sudo ss -ulnp 'sport = :6678'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6678
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6678 '
Windows (Command Prompt)
netstat -ano | findstr :6678
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6678 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6678
From Windows
Test-NetConnection HOST -Port 6678
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6678

Block port 6678 in the firewall

ufw
sudo ufw deny 6678/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6678 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6678 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6678' -Direction Inbound -Protocol TCP -LocalPort 6678 -Action Block
ufw
sudo ufw deny 6678/udp
iptables
sudo iptables -A INPUT -p udp --dport 6678 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6678 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6678' -Direction Inbound -Protocol UDP -LocalPort 6678 -Action Block

Related ports

6672vision-server, vision_server6673vision-elmd, vision_elmd6679osaut6687clever-ctrace

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.