CyberHunter
Local dataset, no network
// Other services

Port 3934: PL/B File Manager Port

Port 3934 is assigned by IANA to sunfm-port (PL/B File Manager Port).

3934

How sunfm-port works

Other services
client:3934sunfm-portresponse client:3934sunfm-portresponse

The client sends a request to port 3934 and the sunfm-port 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 3934 dangerous?

We have no specific security note for port 3934. 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 3934

ServicePortTransportDescriptionReferenceUpdated
sunfm-port 3934 TCP, UDP PL/B File Manager Port - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3934, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3934'      # process listening on 3934
sudo lsof -nP -i :3934

macOS

sudo lsof -nP -i :3934

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3934 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3934
netstat -ano | findstr :3934

From another machine

nmap -p 3934 -sV <host>
sudo nmap -sU -p 3934 <host>
nc -zv <host> 3934

Block it in the firewall

sudo ufw deny 3934/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3934" -Direction Inbound -LocalPort 3934 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3934 used for?

Port 3934 is assigned by IANA to sunfm-port (PL/B File Manager Port).

Is port 3934 TCP or UDP?

Port 3934 is registered for TCP and UDP.

Is it safe to open port 3934?

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 3934 is open?

On Linux run "ss -ltnup 'sport = :3934'", on macOS "lsof -nP -i :3934", and on Windows "netstat -ano | findstr :3934" to see the local process. From another machine, "nmap -p 3934 <host>" shows whether it is reachable.

05 Related
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