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// Other services

Port 2300: CVMMON

Port 2300 is assigned by IANA to cvmmon (CVMMON).

2300

How cvmmon works

Other services
client:2300cvmmonresponse client:2300cvmmonresponse

The client sends a request to port 2300 and the cvmmon 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 2300 dangerous?

We have no specific security note for port 2300. 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 2300

ServicePortTransportDescriptionReferenceUpdated
cvmmon 2300 TCP, UDP CVMMON - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2300, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2300'      # process listening on 2300
sudo lsof -nP -i :2300

macOS

sudo lsof -nP -i :2300

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2300 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2300
netstat -ano | findstr :2300

From another machine

nmap -p 2300 -sV <host>
sudo nmap -sU -p 2300 <host>
nc -zv <host> 2300

Block it in the firewall

sudo ufw deny 2300/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2300" -Direction Inbound -LocalPort 2300 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2300 used for?

Port 2300 is assigned by IANA to cvmmon (CVMMON).

Is port 2300 TCP or UDP?

Port 2300 is registered for TCP and UDP.

Is it safe to open port 2300?

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 2300 is open?

On Linux run "ss -ltnup 'sport = :2300'", on macOS "lsof -nP -i :2300", and on Windows "netstat -ano | findstr :2300" to see the local process. From another machine, "nmap -p 2300 <host>" shows whether it is reachable.

05 Related
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