HTTPfy

Port 3566 (quest-data-hub)

IANA assigns port 3566 to quest-data-hub: Quest Data Hub.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
quest-data-hub TCP Quest Data Hub Greg Cottman 2 -

Registry dates for this port: registered 2010-10-18.

Check what is listening on port 3566

Linux: is anything listening on TCP 3566?
sudo ss -tlnp 'sport = :3566'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3566
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3566 '
Windows (Command Prompt)
netstat -ano | findstr :3566
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3566 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3566
From Windows
Test-NetConnection HOST -Port 3566

Block port 3566 in the firewall

ufw
sudo ufw deny 3566/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3566 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3566' -Direction Inbound -Protocol TCP -LocalPort 3566 -Action Block

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