HTTPfy

Port 1704 (bcs-broker)

IANA assigns port 1704 to bcs-broker.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bcs-broker TCP bcs-broker Andy Warner -
bcs-broker UDP bcs-broker Andy Warner -

Check what is listening on port 1704

Linux: is anything listening on TCP 1704?
sudo ss -tlnp 'sport = :1704'
Linux: UDP 1704
sudo ss -ulnp 'sport = :1704'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1704
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1704 '
Windows (Command Prompt)
netstat -ano | findstr :1704
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1704 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1704
From Windows
Test-NetConnection HOST -Port 1704
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1704

Block port 1704 in the firewall

ufw
sudo ufw deny 1704/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1704 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1704 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1704' -Direction Inbound -Protocol TCP -LocalPort 1704 -Action Block
ufw
sudo ufw deny 1704/udp
iptables
sudo iptables -A INPUT -p udp --dport 1704 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1704 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1704' -Direction Inbound -Protocol UDP -LocalPort 1704 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.