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// Other services

Port 1232: Remote systems monitoring

Port 1232 is assigned by IANA to first-defense (Remote systems monitoring).

1232

How first-defense works

Other services
client:1232first-defenseresponse client:1232first-defenseresponse

The client sends a request to port 1232 and the first-defense 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 1232 dangerous?

We have no specific security note for port 1232. 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 1232

ServicePortTransportDescriptionReferenceUpdated
first-defense 1232 TCP, UDP Remote systems monitoring - 2012-09-21

// source: IANA service name and port number registry

03 Check it

Which program uses port 1232, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1232'      # process listening on 1232
sudo lsof -nP -i :1232

macOS

sudo lsof -nP -i :1232

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1232 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1232
netstat -ano | findstr :1232

From another machine

nmap -p 1232 -sV <host>
sudo nmap -sU -p 1232 <host>
nc -zv <host> 1232

Block it in the firewall

sudo ufw deny 1232/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1232" -Direction Inbound -LocalPort 1232 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1232 used for?

Port 1232 is assigned by IANA to first-defense (Remote systems monitoring).

Is port 1232 TCP or UDP?

Port 1232 is registered for TCP and UDP.

Is it safe to open port 1232?

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 1232 is open?

On Linux run "ss -ltnup 'sport = :1232'", on macOS "lsof -nP -i :1232", and on Windows "netstat -ano | findstr :1232" to see the local process. From another machine, "nmap -p 1232 <host>" shows whether it is reachable.

05 Related
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