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// Other services

Port 3766: SSL e-watch sitewatch server

Port 3766 is assigned by IANA to sitewatch-s (SSL e-watch sitewatch server).

3766

How sitewatch-s works

Other services
client:3766sitewatch-sresponse client:3766sitewatch-sresponse

The client sends a request to port 3766 and the sitewatch-s service answers.

Transport
TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3766 dangerous?

We have no specific security note for port 3766. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3766

ServicePortTransportDescriptionReferenceUpdated
sitewatch-s 3766 TCP SSL e-watch sitewatch server - 2014-05-13
-3766-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 3766, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3766'      # process listening on 3766
sudo lsof -nP -i :3766

macOS

sudo lsof -nP -i :3766

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3766 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3766
netstat -ano | findstr :3766

From another machine

nmap -p 3766 -sV <host>
nc -zv <host> 3766

Block it in the firewall

sudo ufw deny 3766/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3766" -Direction Inbound -LocalPort 3766 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3766 used for?

Port 3766 is assigned by IANA to sitewatch-s (SSL e-watch sitewatch server).

Is port 3766 TCP or UDP?

Port 3766 is registered for TCP.

Is it safe to open port 3766?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 3766 is open?

On Linux run "ss -ltnup 'sport = :3766'", on macOS "lsof -nP -i :3766", and on Windows "netstat -ano | findstr :3766" to see the local process. From another machine, "nmap -p 3766 <host>" shows whether it is reachable.

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