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// Other services

Port 3422: Remote USB System Port

Port 3422 is assigned by IANA to rusb-sys-port (Remote USB System Port).

3422

How rusb-sys-port works

Other services
client:3422rusb-sys-portresponse client:3422rusb-sys-portresponse

The client sends a request to port 3422 and the rusb-sys-port 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 3422 dangerous?

We have no specific security note for port 3422. 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 3422

ServicePortTransportDescriptionReferenceUpdated
rusb-sys-port 3422 TCP, UDP Remote USB System Port - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3422, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3422'      # process listening on 3422
sudo lsof -nP -i :3422

macOS

sudo lsof -nP -i :3422

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3422 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3422
netstat -ano | findstr :3422

From another machine

nmap -p 3422 -sV <host>
sudo nmap -sU -p 3422 <host>
nc -zv <host> 3422

Block it in the firewall

sudo ufw deny 3422/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3422" -Direction Inbound -LocalPort 3422 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3422 used for?

Port 3422 is assigned by IANA to rusb-sys-port (Remote USB System Port).

Is port 3422 TCP or UDP?

Port 3422 is registered for TCP and UDP.

Is it safe to open port 3422?

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 3422 is open?

On Linux run "ss -ltnup 'sport = :3422'", on macOS "lsof -nP -i :3422", and on Windows "netstat -ano | findstr :3422" to see the local process. From another machine, "nmap -p 3422 <host>" shows whether it is reachable.

05 Related
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