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// Other services

Port 429: OCS_AMU

Port 429 is assigned by IANA to ocs_amu (OCS_AMU), ocs-amu (OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu".).

429

How ocs_amu works

Other services
client:429ocs_amuresponse client:429ocs_amuresponse

The client sends a request to port 429 and the ocs_amu service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 429 dangerous?

We have no specific security note for port 429. 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 429

ServicePortTransportDescriptionReferenceUpdated
ocs_amu 429 TCP, UDP OCS_AMU - -
ocs-amu 429 TCP, UDP OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 429, and is it reachable?

Linux

sudo ss -ltnup 'sport = :429'      # process listening on 429
sudo lsof -nP -i :429

macOS

sudo lsof -nP -i :429

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 429 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 429
netstat -ano | findstr :429

From another machine

nmap -p 429 -sV <host>
sudo nmap -sU -p 429 <host>
nc -zv <host> 429

Block it in the firewall

sudo ufw deny 429/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 429" -Direction Inbound -LocalPort 429 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 429 used for?

Port 429 is assigned by IANA to ocs_amu (OCS_AMU), ocs-amu (OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu".).

Is port 429 TCP or UDP?

Port 429 is registered for TCP and UDP.

Is it safe to open port 429?

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 429 is open?

On Linux run "ss -ltnup 'sport = :429'", on macOS "lsof -nP -i :429", and on Windows "netstat -ano | findstr :429" to see the local process. From another machine, "nmap -p 429 <host>" shows whether it is reachable.

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