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// Other services

Port 4084: Fortisphere VM Service

Port 4084 is assigned by IANA to fortisphere-vm (Fortisphere VM Service).

4084

How fortisphere-vm works

Other services
client:4084fortisphere-vmresponse client:4084fortisphere-vmresponse

The client sends a request to port 4084 and the fortisphere-vm service answers.

Transport
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 4084 dangerous?

We have no specific security note for port 4084. 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 4084

ServicePortTransportDescriptionReferenceUpdated
fortisphere-vm 4084 UDP Fortisphere VM Service - 2008-06-03
-4084-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4084, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4084'      # process listening on 4084
sudo lsof -nP -i :4084

macOS

sudo lsof -nP -i :4084

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4084 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4084
netstat -ano | findstr :4084

From another machine

nmap -p 4084 -sV <host>
sudo nmap -sU -p 4084 <host>
nc -zv <host> 4084

Block it in the firewall

sudo ufw deny 4084/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4084" -Direction Inbound -LocalPort 4084 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4084 used for?

Port 4084 is assigned by IANA to fortisphere-vm (Fortisphere VM Service).

Is port 4084 TCP or UDP?

Port 4084 is registered for UDP.

Is it safe to open port 4084?

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 4084 is open?

On Linux run "ss -ltnup 'sport = :4084'", on macOS "lsof -nP -i :4084", and on Windows "netstat -ano | findstr :4084" to see the local process. From another machine, "nmap -p 4084 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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