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// Other services

Port 4673: CXWS Operations

Port 4673 is assigned by IANA to cxws (CXWS Operations).

4673

How cxws works

Other services
client:4673cxwsresponse client:4673cxwsresponse

The client sends a request to port 4673 and the cxws 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 4673 dangerous?

We have no specific security note for port 4673. 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 4673

ServicePortTransportDescriptionReferenceUpdated
cxws 4673 TCP, UDP CXWS Operations - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4673, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4673'      # process listening on 4673
sudo lsof -nP -i :4673

macOS

sudo lsof -nP -i :4673

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4673 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4673
netstat -ano | findstr :4673

From another machine

nmap -p 4673 -sV <host>
sudo nmap -sU -p 4673 <host>
nc -zv <host> 4673

Block it in the firewall

sudo ufw deny 4673/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4673" -Direction Inbound -LocalPort 4673 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4673 used for?

Port 4673 is assigned by IANA to cxws (CXWS Operations).

Is port 4673 TCP or UDP?

Port 4673 is registered for TCP and UDP.

Is it safe to open port 4673?

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 4673 is open?

On Linux run "ss -ltnup 'sport = :4673'", on macOS "lsof -nP -i :4673", and on Windows "netstat -ano | findstr :4673" to see the local process. From another machine, "nmap -p 4673 <host>" shows whether it is reachable.

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