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// Other services

Port 28000: NX License Manager

Port 28000 is assigned by IANA to nxlmd (NX License Manager).

28000

How nxlmd works

Other services
client:28000nxlmdresponse client:28000nxlmdresponse

The client sends a request to port 28000 and the nxlmd 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 28000 dangerous?

We have no specific security note for port 28000. 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 28000

ServicePortTransportDescriptionReferenceUpdated
nxlmd 28000 TCP, UDP NX License Manager
Reported: Unauthorized Use Known on port 28000
 - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 28000, and is it reachable?

Linux

sudo ss -ltnup 'sport = :28000'      # process listening on 28000
sudo lsof -nP -i :28000

macOS

sudo lsof -nP -i :28000

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 28000 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 28000
netstat -ano | findstr :28000

From another machine

nmap -p 28000 -sV <host>
sudo nmap -sU -p 28000 <host>
nc -zv <host> 28000

Block it in the firewall

sudo ufw deny 28000/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 28000" -Direction Inbound -LocalPort 28000 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 28000 used for?

Port 28000 is assigned by IANA to nxlmd (NX License Manager).

Is port 28000 TCP or UDP?

Port 28000 is registered for TCP and UDP.

Is it safe to open port 28000?

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 28000 is open?

On Linux run "ss -ltnup 'sport = :28000'", on macOS "lsof -nP -i :28000", and on Windows "netstat -ano | findstr :28000" to see the local process. From another machine, "nmap -p 28000 <host>" shows whether it is reachable.

05 Related
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