Port 8043 (fs-server)

IANA assigns port 8043 to fs-server: FireScope Server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

fs-server TCP FireScope Server Matt Rogers -

Registry dates for this port: registered 2008-10-16.

Linux: is anything listening on TCP 8043?

sudo ss -tlnp 'sport = :8043'

Linux / macOS: which process owns the port

sudo lsof -nP -i :8043

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':8043 '

Windows (Command Prompt)

netstat -ano | findstr :8043

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8043 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 8043

From Windows

Test-NetConnection HOST -Port 8043

ufw

sudo ufw deny 8043/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 8043 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 8043 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 8043' -Direction Inbound -Protocol TCP -LocalPort 8043 -Action Block

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