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// Other services

Port 759:

Port 759 is assigned by IANA to con ().

759

How con works

Other services
client:759conresponse client:759conresponse

The client sends a request to port 759 and the con 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 759 dangerous?

We have no specific security note for port 759. 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 759

ServicePortTransportDescriptionReferenceUpdated
con 759 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 759, and is it reachable?

Linux

sudo ss -ltnup 'sport = :759'      # process listening on 759
sudo lsof -nP -i :759

macOS

sudo lsof -nP -i :759

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 759 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 759
netstat -ano | findstr :759

From another machine

nmap -p 759 -sV <host>
sudo nmap -sU -p 759 <host>
nc -zv <host> 759

Block it in the firewall

sudo ufw deny 759/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 759" -Direction Inbound -LocalPort 759 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 759 used for?

Port 759 is assigned by IANA to con ().

Is port 759 TCP or UDP?

Port 759 is registered for TCP and UDP.

Is it safe to open port 759?

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 759 is open?

On Linux run "ss -ltnup 'sport = :759'", on macOS "lsof -nP -i :759", and on Windows "netstat -ano | findstr :759" to see the local process. From another machine, "nmap -p 759 <host>" shows whether it is reachable.

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