Port 7847 (csoauth)

IANA assigns port 7847 to csoauth: A product key authentication protocol made by CSO.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

csoauth TCP A product key authentication protocol made by CSO Jeff Wamsley -

Registry dates for this port: registered 2013-09-04.

Linux: is anything listening on TCP 7847?

sudo ss -tlnp 'sport = :7847'

Linux / macOS: which process owns the port

sudo lsof -nP -i :7847

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':7847 '

Windows (Command Prompt)

netstat -ano | findstr :7847

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7847 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 7847

From Windows

Test-NetConnection HOST -Port 7847

ufw

sudo ufw deny 7847/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 7847 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 7847 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 7847' -Direction Inbound -Protocol TCP -LocalPort 7847 -Action Block

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