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// Other services

Port 1339: kjtsiteserver

Port 1339 is assigned by IANA to kjtsiteserver (kjtsiteserver).

1339

How kjtsiteserver works

Other services
client:1339kjtsiteserverresponse client:1339kjtsiteserverresponse

The client sends a request to port 1339 and the kjtsiteserver 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 1339 dangerous?

We have no specific security note for port 1339. 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 1339

ServicePortTransportDescriptionReferenceUpdated
kjtsiteserver 1339 TCP, UDP kjtsiteserver - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1339, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1339'      # process listening on 1339
sudo lsof -nP -i :1339

macOS

sudo lsof -nP -i :1339

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1339 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1339
netstat -ano | findstr :1339

From another machine

nmap -p 1339 -sV <host>
sudo nmap -sU -p 1339 <host>
nc -zv <host> 1339

Block it in the firewall

sudo ufw deny 1339/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1339" -Direction Inbound -LocalPort 1339 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1339 used for?

Port 1339 is assigned by IANA to kjtsiteserver (kjtsiteserver).

Is port 1339 TCP or UDP?

Port 1339 is registered for TCP and UDP.

Is it safe to open port 1339?

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 1339 is open?

On Linux run "ss -ltnup 'sport = :1339'", on macOS "lsof -nP -i :1339", and on Windows "netstat -ano | findstr :1339" to see the local process. From another machine, "nmap -p 1339 <host>" shows whether it is reachable.

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