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// Other services

Port 4322: TRIM Event Service

Port 4322 is assigned by IANA to trim-event (TRIM Event Service).

4322

How trim-event works

Other services
client:4322trim-eventresponse client:4322trim-eventresponse

The client sends a request to port 4322 and the trim-event 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 4322 dangerous?

We have no specific security note for port 4322. 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 4322

ServicePortTransportDescriptionReferenceUpdated
trim-event 4322 TCP, UDP TRIM Event Service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4322, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4322'      # process listening on 4322
sudo lsof -nP -i :4322

macOS

sudo lsof -nP -i :4322

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4322 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4322
netstat -ano | findstr :4322

From another machine

nmap -p 4322 -sV <host>
sudo nmap -sU -p 4322 <host>
nc -zv <host> 4322

Block it in the firewall

sudo ufw deny 4322/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4322" -Direction Inbound -LocalPort 4322 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4322 used for?

Port 4322 is assigned by IANA to trim-event (TRIM Event Service).

Is port 4322 TCP or UDP?

Port 4322 is registered for TCP and UDP.

Is it safe to open port 4322?

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 4322 is open?

On Linux run "ss -ltnup 'sport = :4322'", on macOS "lsof -nP -i :4322", and on Windows "netstat -ano | findstr :4322" to see the local process. From another machine, "nmap -p 4322 <host>" shows whether it is reachable.

05 Related
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