CyberHunter
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// Other services

Port 2559: LSTP

Port 2559 is assigned by IANA to lstp (LSTP).

2559

How lstp works

Other services
client:2559lstpresponse client:2559lstpresponse

The client sends a request to port 2559 and the lstp 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 2559 dangerous?

We have no specific security note for port 2559. 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 2559

ServicePortTransportDescriptionReferenceUpdated
lstp 2559 TCP, UDP LSTP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2559, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2559'      # process listening on 2559
sudo lsof -nP -i :2559

macOS

sudo lsof -nP -i :2559

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2559 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2559
netstat -ano | findstr :2559

From another machine

nmap -p 2559 -sV <host>
sudo nmap -sU -p 2559 <host>
nc -zv <host> 2559

Block it in the firewall

sudo ufw deny 2559/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2559" -Direction Inbound -LocalPort 2559 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2559 used for?

Port 2559 is assigned by IANA to lstp (LSTP).

Is port 2559 TCP or UDP?

Port 2559 is registered for TCP and UDP.

Is it safe to open port 2559?

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 2559 is open?

On Linux run "ss -ltnup 'sport = :2559'", on macOS "lsof -nP -i :2559", and on Windows "netstat -ano | findstr :2559" to see the local process. From another machine, "nmap -p 2559 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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