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// Other services

Port 829: PKIX-3 CA/RA

Port 829 is assigned by IANA to pkix-3-ca-ra (PKIX-3 CA/RA).

829

How pkix-3-ca-ra works

Other services
client:829pkix-3-ca-raresponse client:829pkix-3-ca-raresponse

The client sends a request to port 829 and the pkix-3-ca-ra 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 829 dangerous?

We have no specific security note for port 829. 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 829

ServicePortTransportDescriptionReferenceUpdated
pkix-3-ca-ra 829 TCP, UDP PKIX-3 CA/RA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 829, and is it reachable?

Linux

sudo ss -ltnup 'sport = :829'      # process listening on 829
sudo lsof -nP -i :829

macOS

sudo lsof -nP -i :829

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 829 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 829
netstat -ano | findstr :829

From another machine

nmap -p 829 -sV <host>
sudo nmap -sU -p 829 <host>
nc -zv <host> 829

Block it in the firewall

sudo ufw deny 829/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 829" -Direction Inbound -LocalPort 829 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 829 used for?

Port 829 is assigned by IANA to pkix-3-ca-ra (PKIX-3 CA/RA).

Is port 829 TCP or UDP?

Port 829 is registered for TCP and UDP.

Is it safe to open port 829?

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 829 is open?

On Linux run "ss -ltnup 'sport = :829'", on macOS "lsof -nP -i :829", and on Windows "netstat -ano | findstr :829" to see the local process. From another machine, "nmap -p 829 <host>" shows whether it is reachable.

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