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// Other services

Port 3120: D2000 Webserver Port

Port 3120 is assigned by IANA to d2000webserver (D2000 Webserver Port).

3120

How d2000webserver works

Other services
client:3120d2000webserverresponse client:3120d2000webserverresponse

The client sends a request to port 3120 and the d2000webserver 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 3120 dangerous?

We have no specific security note for port 3120. 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 3120

ServicePortTransportDescriptionReferenceUpdated
d2000webserver 3120 TCP, UDP D2000 Webserver Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3120, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3120'      # process listening on 3120
sudo lsof -nP -i :3120

macOS

sudo lsof -nP -i :3120

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3120 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3120
netstat -ano | findstr :3120

From another machine

nmap -p 3120 -sV <host>
sudo nmap -sU -p 3120 <host>
nc -zv <host> 3120

Block it in the firewall

sudo ufw deny 3120/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3120" -Direction Inbound -LocalPort 3120 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3120 used for?

Port 3120 is assigned by IANA to d2000webserver (D2000 Webserver Port).

Is port 3120 TCP or UDP?

Port 3120 is registered for TCP and UDP.

Is it safe to open port 3120?

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 3120 is open?

On Linux run "ss -ltnup 'sport = :3120'", on macOS "lsof -nP -i :3120", and on Windows "netstat -ano | findstr :3120" to see the local process. From another machine, "nmap -p 3120 <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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