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// Other services

Port 4672: remote file access server

Port 4672 is assigned by IANA to rfa (remote file access server).

4672

How rfa works

Other services
client:4672rfaresponse client:4672rfaresponse

The client sends a request to port 4672 and the rfa 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 4672 dangerous?

We have no specific security note for port 4672. 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 4672

ServicePortTransportDescriptionReferenceUpdated
rfa 4672 TCP, UDP remote file access server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4672, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4672'      # process listening on 4672
sudo lsof -nP -i :4672

macOS

sudo lsof -nP -i :4672

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4672 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4672
netstat -ano | findstr :4672

From another machine

nmap -p 4672 -sV <host>
sudo nmap -sU -p 4672 <host>
nc -zv <host> 4672

Block it in the firewall

sudo ufw deny 4672/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4672" -Direction Inbound -LocalPort 4672 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4672 used for?

Port 4672 is assigned by IANA to rfa (remote file access server).

Is port 4672 TCP or UDP?

Port 4672 is registered for TCP and UDP.

Is it safe to open port 4672?

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 4672 is open?

On Linux run "ss -ltnup 'sport = :4672'", on macOS "lsof -nP -i :4672", and on Windows "netstat -ano | findstr :4672" to see the local process. From another machine, "nmap -p 4672 <host>" shows whether it is reachable.

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