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Port 4677 (bcs)

IANA assigns port 4677 to bcs: Business Continuity Servi.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bcs TCP Business Continuity Servi Siew Sim -
bcs UDP Business Continuity Servi Siew Sim -

Registry dates for this port: registered 2005-08.

Check what is listening on port 4677

Linux: is anything listening on TCP 4677?
sudo ss -tlnp 'sport = :4677'
Linux: UDP 4677
sudo ss -ulnp 'sport = :4677'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4677
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4677 '
Windows (Command Prompt)
netstat -ano | findstr :4677
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4677 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4677
From Windows
Test-NetConnection HOST -Port 4677
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4677

Block port 4677 in the firewall

ufw
sudo ufw deny 4677/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4677 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4677 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4677' -Direction Inbound -Protocol TCP -LocalPort 4677 -Action Block
ufw
sudo ufw deny 4677/udp
iptables
sudo iptables -A INPUT -p udp --dport 4677 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4677 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4677' -Direction Inbound -Protocol UDP -LocalPort 4677 -Action Block

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4675dhct-status4676dhct-alerts4678traversal4679mgesupervision

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