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// Other services

Port 590: TNS CML

Port 590 is assigned by IANA to tns-cml (TNS CML).

590

How tns-cml works

Other services
client:590tns-cmlresponse client:590tns-cmlresponse

The client sends a request to port 590 and the tns-cml 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 590 dangerous?

We have no specific security note for port 590. 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 590

ServicePortTransportDescriptionReferenceUpdated
tns-cml 590 TCP, UDP TNS CML - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 590, and is it reachable?

Linux

sudo ss -ltnup 'sport = :590'      # process listening on 590
sudo lsof -nP -i :590

macOS

sudo lsof -nP -i :590

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 590 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 590
netstat -ano | findstr :590

From another machine

nmap -p 590 -sV <host>
sudo nmap -sU -p 590 <host>
nc -zv <host> 590

Block it in the firewall

sudo ufw deny 590/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 590" -Direction Inbound -LocalPort 590 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 590 used for?

Port 590 is assigned by IANA to tns-cml (TNS CML).

Is port 590 TCP or UDP?

Port 590 is registered for TCP and UDP.

Is it safe to open port 590?

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 590 is open?

On Linux run "ss -ltnup 'sport = :590'", on macOS "lsof -nP -i :590", and on Windows "netstat -ano | findstr :590" to see the local process. From another machine, "nmap -p 590 <host>" shows whether it is reachable.

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