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// Other services

Port 2419: Attachmate S2S

Port 2419 is assigned by IANA to attachmate-s2s (Attachmate S2S).

2419

How attachmate-s2s works

Other services
client:2419attachmate-s2sresponse client:2419attachmate-s2sresponse

The client sends a request to port 2419 and the attachmate-s2s 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 2419 dangerous?

We have no specific security note for port 2419. 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 2419

ServicePortTransportDescriptionReferenceUpdated
attachmate-s2s 2419 TCP, UDP Attachmate S2S - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2419, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2419'      # process listening on 2419
sudo lsof -nP -i :2419

macOS

sudo lsof -nP -i :2419

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2419 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2419
netstat -ano | findstr :2419

From another machine

nmap -p 2419 -sV <host>
sudo nmap -sU -p 2419 <host>
nc -zv <host> 2419

Block it in the firewall

sudo ufw deny 2419/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2419" -Direction Inbound -LocalPort 2419 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2419 used for?

Port 2419 is assigned by IANA to attachmate-s2s (Attachmate S2S).

Is port 2419 TCP or UDP?

Port 2419 is registered for TCP and UDP.

Is it safe to open port 2419?

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 2419 is open?

On Linux run "ss -ltnup 'sport = :2419'", on macOS "lsof -nP -i :2419", and on Windows "netstat -ano | findstr :2419" to see the local process. From another machine, "nmap -p 2419 <host>" shows whether it is reachable.

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