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// Other services

Port 259: Efficient Short Remote Operations

Port 259 is assigned by IANA to esro-gen (Efficient Short Remote Operations).

259

How esro-gen works

Other services
client:259esro-genresponse client:259esro-genresponse

The client sends a request to port 259 and the esro-gen 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 259 dangerous?

We have no specific security note for port 259. 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 259

ServicePortTransportDescriptionReferenceUpdated
esro-gen 259 TCP, UDP Efficient Short Remote Operations - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 259, and is it reachable?

Linux

sudo ss -ltnup 'sport = :259'      # process listening on 259
sudo lsof -nP -i :259

macOS

sudo lsof -nP -i :259

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 259 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 259
netstat -ano | findstr :259

From another machine

nmap -p 259 -sV <host>
sudo nmap -sU -p 259 <host>
nc -zv <host> 259

Block it in the firewall

sudo ufw deny 259/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 259" -Direction Inbound -LocalPort 259 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 259 used for?

Port 259 is assigned by IANA to esro-gen (Efficient Short Remote Operations).

Is port 259 TCP or UDP?

Port 259 is registered for TCP and UDP.

Is it safe to open port 259?

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 259 is open?

On Linux run "ss -ltnup 'sport = :259'", on macOS "lsof -nP -i :259", and on Windows "netstat -ano | findstr :259" to see the local process. From another machine, "nmap -p 259 <host>" shows whether it is reachable.

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