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// Other services

Port 4366: ShadowStream System

Port 4366 is assigned by IANA to shadowstream (ShadowStream System).

4366

How shadowstream works

Other services
client:4366shadowstreamresponse client:4366shadowstreamresponse

The client sends a request to port 4366 and the shadowstream service answers.

Transport
UDP
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 4366 dangerous?

We have no specific security note for port 4366. 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 4366

ServicePortTransportDescriptionReferenceUpdated
shadowstream 4366 UDP ShadowStream System - 2014-12-17
-4366-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4366, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4366'      # process listening on 4366
sudo lsof -nP -i :4366

macOS

sudo lsof -nP -i :4366

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4366 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4366
netstat -ano | findstr :4366

From another machine

nmap -p 4366 -sV <host>
sudo nmap -sU -p 4366 <host>
nc -zv <host> 4366

Block it in the firewall

sudo ufw deny 4366/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4366" -Direction Inbound -LocalPort 4366 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4366 used for?

Port 4366 is assigned by IANA to shadowstream (ShadowStream System).

Is port 4366 TCP or UDP?

Port 4366 is registered for UDP.

Is it safe to open port 4366?

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 4366 is open?

On Linux run "ss -ltnup 'sport = :4366'", on macOS "lsof -nP -i :4366", and on Windows "netstat -ano | findstr :4366" to see the local process. From another machine, "nmap -p 4366 <host>" shows whether it is reachable.

05 Related
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