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Port 5566 (westec-connect)

IANA assigns port 5566 to westec-connect: Westec Connect.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
westec-connect TCP Westec Connect Jon Bolen -

Registry dates for this port: registered 2009-03-18.

Check what is listening on port 5566

Linux: is anything listening on TCP 5566?
sudo ss -tlnp 'sport = :5566'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5566
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5566 '
Windows (Command Prompt)
netstat -ano | findstr :5566
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5566 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5566
From Windows
Test-NetConnection HOST -Port 5566

Block port 5566 in the firewall

ufw
sudo ufw deny 5566/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5566 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5566' -Direction Inbound -Protocol TCP -LocalPort 5566 -Action Block

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