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// Other services

Port 3890: Niche Data Server Connect

Port 3890 is assigned by IANA to ndsconnect (Niche Data Server Connect).

3890

How ndsconnect works

Other services
client:3890ndsconnectresponse client:3890ndsconnectresponse

The client sends a request to port 3890 and the ndsconnect 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 3890 dangerous?

We have no specific security note for port 3890. 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 3890

ServicePortTransportDescriptionReferenceUpdated
ndsconnect 3890 TCP, UDP Niche Data Server Connect - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3890, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3890'      # process listening on 3890
sudo lsof -nP -i :3890

macOS

sudo lsof -nP -i :3890

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3890 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3890
netstat -ano | findstr :3890

From another machine

nmap -p 3890 -sV <host>
sudo nmap -sU -p 3890 <host>
nc -zv <host> 3890

Block it in the firewall

sudo ufw deny 3890/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3890" -Direction Inbound -LocalPort 3890 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3890 used for?

Port 3890 is assigned by IANA to ndsconnect (Niche Data Server Connect).

Is port 3890 TCP or UDP?

Port 3890 is registered for TCP and UDP.

Is it safe to open port 3890?

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 3890 is open?

On Linux run "ss -ltnup 'sport = :3890'", on macOS "lsof -nP -i :3890", and on Windows "netstat -ano | findstr :3890" to see the local process. From another machine, "nmap -p 3890 <host>" shows whether it is reachable.

05 Related
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