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// Other services

Port 4004: pxc-roid

Port 4004 is assigned by IANA to pxc-roid (pxc-roid).

4004

How pxc-roid works

Other services
client:4004pxc-roidresponse client:4004pxc-roidresponse

The client sends a request to port 4004 and the pxc-roid 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 4004 dangerous?

We have no specific security note for port 4004. 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 4004

ServicePortTransportDescriptionReferenceUpdated
pxc-roid 4004 TCP, UDP pxc-roid - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4004, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4004'      # process listening on 4004
sudo lsof -nP -i :4004

macOS

sudo lsof -nP -i :4004

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4004 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4004
netstat -ano | findstr :4004

From another machine

nmap -p 4004 -sV <host>
sudo nmap -sU -p 4004 <host>
nc -zv <host> 4004

Block it in the firewall

sudo ufw deny 4004/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4004" -Direction Inbound -LocalPort 4004 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4004 used for?

Port 4004 is assigned by IANA to pxc-roid (pxc-roid).

Is port 4004 TCP or UDP?

Port 4004 is registered for TCP and UDP.

Is it safe to open port 4004?

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 4004 is open?

On Linux run "ss -ltnup 'sport = :4004'", on macOS "lsof -nP -i :4004", and on Windows "netstat -ano | findstr :4004" to see the local process. From another machine, "nmap -p 4004 <host>" shows whether it is reachable.

05 Related
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