CyberHunter
Local dataset, no network
// Other services

Port 417: Onmux

Port 417 is assigned by IANA to onmux (Onmux).

417

How onmux works

Other services
client:417onmuxresponse client:417onmuxresponse

The client sends a request to port 417 and the onmux 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 417 dangerous?

We have no specific security note for port 417. 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 417

ServicePortTransportDescriptionReferenceUpdated
onmux 417 TCP, UDP Onmux - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 417, and is it reachable?

Linux

sudo ss -ltnup 'sport = :417'      # process listening on 417
sudo lsof -nP -i :417

macOS

sudo lsof -nP -i :417

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 417 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 417
netstat -ano | findstr :417

From another machine

nmap -p 417 -sV <host>
sudo nmap -sU -p 417 <host>
nc -zv <host> 417

Block it in the firewall

sudo ufw deny 417/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 417" -Direction Inbound -LocalPort 417 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 417 used for?

Port 417 is assigned by IANA to onmux (Onmux).

Is port 417 TCP or UDP?

Port 417 is registered for TCP and UDP.

Is it safe to open port 417?

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 417 is open?

On Linux run "ss -ltnup 'sport = :417'", on macOS "lsof -nP -i :417", and on Windows "netstat -ano | findstr :417" to see the local process. From another machine, "nmap -p 417 <host>" shows whether it is reachable.

05 Related
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