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// Other services

Port 2401: cvspserver

Port 2401 is assigned by IANA to cvspserver (cvspserver).

2401

How cvspserver works

Other services
client:2401cvspserverresponse client:2401cvspserverresponse

The client sends a request to port 2401 and the cvspserver 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 2401 dangerous?

We have no specific security note for port 2401. 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 2401

ServicePortTransportDescriptionReferenceUpdated
cvspserver 2401 TCP, UDP cvspserver - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2401, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2401'      # process listening on 2401
sudo lsof -nP -i :2401

macOS

sudo lsof -nP -i :2401

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2401 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2401
netstat -ano | findstr :2401

From another machine

nmap -p 2401 -sV <host>
sudo nmap -sU -p 2401 <host>
nc -zv <host> 2401

Block it in the firewall

sudo ufw deny 2401/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2401" -Direction Inbound -LocalPort 2401 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2401 used for?

Port 2401 is assigned by IANA to cvspserver (cvspserver).

Is port 2401 TCP or UDP?

Port 2401 is registered for TCP and UDP.

Is it safe to open port 2401?

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 2401 is open?

On Linux run "ss -ltnup 'sport = :2401'", on macOS "lsof -nP -i :2401", and on Windows "netstat -ano | findstr :2401" to see the local process. From another machine, "nmap -p 2401 <host>" shows whether it is reachable.

05 Related
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