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// Other services

Port 2869: ICSLAP

Port 2869 is assigned by IANA to icslap (ICSLAP).

2869

How icslap works

Other services
client:2869icslapresponse client:2869icslapresponse

The client sends a request to port 2869 and the icslap 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 2869 dangerous?

We have no specific security note for port 2869. 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 2869

ServicePortTransportDescriptionReferenceUpdated
icslap 2869 TCP, UDP ICSLAP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2869, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2869'      # process listening on 2869
sudo lsof -nP -i :2869

macOS

sudo lsof -nP -i :2869

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2869 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2869
netstat -ano | findstr :2869

From another machine

nmap -p 2869 -sV <host>
sudo nmap -sU -p 2869 <host>
nc -zv <host> 2869

Block it in the firewall

sudo ufw deny 2869/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2869" -Direction Inbound -LocalPort 2869 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2869 used for?

Port 2869 is assigned by IANA to icslap (ICSLAP).

Is port 2869 TCP or UDP?

Port 2869 is registered for TCP and UDP.

Is it safe to open port 2869?

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 2869 is open?

On Linux run "ss -ltnup 'sport = :2869'", on macOS "lsof -nP -i :2869", and on Windows "netstat -ano | findstr :2869" to see the local process. From another machine, "nmap -p 2869 <host>" shows whether it is reachable.

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