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// Other services

Port 4671: Bull RSF action server

Port 4671 is assigned by IANA to acter (Bull RSF action server).

4671

How acter works

Other services
client:4671acterresponse client:4671acterresponse

The client sends a request to port 4671 and the acter 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 4671 dangerous?

We have no specific security note for port 4671. 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 4671

ServicePortTransportDescriptionReferenceUpdated
acter 4671 TCP, UDP Bull RSF action server - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4671, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4671'      # process listening on 4671
sudo lsof -nP -i :4671

macOS

sudo lsof -nP -i :4671

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4671 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4671
netstat -ano | findstr :4671

From another machine

nmap -p 4671 -sV <host>
sudo nmap -sU -p 4671 <host>
nc -zv <host> 4671

Block it in the firewall

sudo ufw deny 4671/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4671" -Direction Inbound -LocalPort 4671 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4671 used for?

Port 4671 is assigned by IANA to acter (Bull RSF action server).

Is port 4671 TCP or UDP?

Port 4671 is registered for TCP and UDP.

Is it safe to open port 4671?

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 4671 is open?

On Linux run "ss -ltnup 'sport = :4671'", on macOS "lsof -nP -i :4671", and on Windows "netstat -ano | findstr :4671" to see the local process. From another machine, "nmap -p 4671 <host>" shows whether it is reachable.

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