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// Other services

Port 3940: XeCP Node Service

Port 3940 is assigned by IANA to xecp-node (XeCP Node Service).

3940

How xecp-node works

Other services
client:3940xecp-noderesponse client:3940xecp-noderesponse

The client sends a request to port 3940 and the xecp-node 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 3940 dangerous?

We have no specific security note for port 3940. 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 3940

ServicePortTransportDescriptionReferenceUpdated
xecp-node 3940 TCP, UDP XeCP Node Service - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3940, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3940'      # process listening on 3940
sudo lsof -nP -i :3940

macOS

sudo lsof -nP -i :3940

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3940 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3940
netstat -ano | findstr :3940

From another machine

nmap -p 3940 -sV <host>
sudo nmap -sU -p 3940 <host>
nc -zv <host> 3940

Block it in the firewall

sudo ufw deny 3940/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3940" -Direction Inbound -LocalPort 3940 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3940 used for?

Port 3940 is assigned by IANA to xecp-node (XeCP Node Service).

Is port 3940 TCP or UDP?

Port 3940 is registered for TCP and UDP.

Is it safe to open port 3940?

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 3940 is open?

On Linux run "ss -ltnup 'sport = :3940'", on macOS "lsof -nP -i :3940", and on Windows "netstat -ano | findstr :3940" to see the local process. From another machine, "nmap -p 3940 <host>" shows whether it is reachable.

05 Related
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