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Port 3166 (sossecollector)

IANA assigns port 3166 to sossecollector: Quest Spotlight Out-Of-Process Collector.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sossecollector TCP Quest Spotlight Out-Of-Process Collector Greg Cottman -
sossecollector UDP Quest Spotlight Out-Of-Process Collector Greg Cottman -

Registry dates for this port: registered 2008-10-23.

Check what is listening on port 3166

Linux: is anything listening on TCP 3166?
sudo ss -tlnp 'sport = :3166'
Linux: UDP 3166
sudo ss -ulnp 'sport = :3166'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3166
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3166 '
Windows (Command Prompt)
netstat -ano | findstr :3166
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3166 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3166
From Windows
Test-NetConnection HOST -Port 3166
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3166

Block port 3166 in the firewall

ufw
sudo ufw deny 3166/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3166 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3166 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3166' -Direction Inbound -Protocol TCP -LocalPort 3166 -Action Block
ufw
sudo ufw deny 3166/udp
iptables
sudo iptables -A INPUT -p udp --dport 3166 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3166 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3166' -Direction Inbound -Protocol UDP -LocalPort 3166 -Action Block

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