CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 5566: Westec Connect

Port 5566 is assigned by IANA to westec-connect (Westec Connect).

5566

How westec-connect works

Other services
client:5566westec-connectresponse client:5566westec-connectresponse

The client sends a request to port 5566 and the westec-connect 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 5566 dangerous?

We have no specific security note for port 5566. 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 5566

ServicePortTransportDescriptionReferenceUpdated
westec-connect 5566 TCP Westec Connect - 2009-03-18
-5566-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5566, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5566'      # process listening on 5566
sudo lsof -nP -i :5566

macOS

sudo lsof -nP -i :5566

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5566 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5566
netstat -ano | findstr :5566

From another machine

nmap -p 5566 -sV <host>
nc -zv <host> 5566

Block it in the firewall

sudo ufw deny 5566/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5566" -Direction Inbound -LocalPort 5566 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5566 used for?

Port 5566 is assigned by IANA to westec-connect (Westec Connect).

Is port 5566 TCP or UDP?

Port 5566 is registered for TCP.

Is it safe to open port 5566?

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 5566 is open?

On Linux run "ss -ltnup 'sport = :5566'", on macOS "lsof -nP -i :5566", and on Windows "netstat -ano | findstr :5566" to see the local process. From another machine, "nmap -p 5566 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news