Port 3766 (sitewatch-s)

IANA assigns port 3766 to sitewatch-s: SSL e-watch sitewatch server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

sitewatch-s TCP SSL e-watch sitewatch server
this port was previously updated on 2009-06-19 e-Watch Corporation -

Registry dates for this port: registered 2014-05-13.

Linux: is anything listening on TCP 3766?

sudo ss -tlnp 'sport = :3766'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3766

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3766 '

Windows (Command Prompt)

netstat -ano | findstr :3766

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3766 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 3766

From Windows

Test-NetConnection HOST -Port 3766

ufw

sudo ufw deny 3766/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3766 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3766 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3766' -Direction Inbound -Protocol TCP -LocalPort 3766 -Action Block

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