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// Other services

Port 4389: Xandros Community Management Service

Port 4389 is assigned by IANA to xandros-cms (Xandros Community Management Service).

4389

How xandros-cms works

Other services
client:4389xandros-cmsresponse client:4389xandros-cmsresponse

The client sends a request to port 4389 and the xandros-cms service answers.

Transport
TCP · 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 4389 dangerous?

We have no specific security note for port 4389. 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 4389

ServicePortTransportDescriptionReferenceUpdated
xandros-cms 4389 TCP, UDP Xandros Community Management Service - 2007-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 4389, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4389'      # process listening on 4389
sudo lsof -nP -i :4389

macOS

sudo lsof -nP -i :4389

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4389 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4389
netstat -ano | findstr :4389

From another machine

nmap -p 4389 -sV <host>
sudo nmap -sU -p 4389 <host>
nc -zv <host> 4389

Block it in the firewall

sudo ufw deny 4389/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4389" -Direction Inbound -LocalPort 4389 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4389 used for?

Port 4389 is assigned by IANA to xandros-cms (Xandros Community Management Service).

Is port 4389 TCP or UDP?

Port 4389 is registered for TCP and UDP.

Is it safe to open port 4389?

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 4389 is open?

On Linux run "ss -ltnup 'sport = :4389'", on macOS "lsof -nP -i :4389", and on Windows "netstat -ano | findstr :4389" to see the local process. From another machine, "nmap -p 4389 <host>" shows whether it is reachable.

05 Related
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