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// Other services

Port 4379: CTDB

Port 4379 is assigned by IANA to ctdb (CTDB).

4379

How ctdb works

Other services
client:4379ctdbresponse client:4379ctdbresponse

The client sends a request to port 4379 and the ctdb 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 4379 dangerous?

We have no specific security note for port 4379. 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 4379

ServicePortTransportDescriptionReferenceUpdated
ctdb 4379 TCP, UDP CTDB - 2007-07-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 4379, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4379'      # process listening on 4379
sudo lsof -nP -i :4379

macOS

sudo lsof -nP -i :4379

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4379 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4379
netstat -ano | findstr :4379

From another machine

nmap -p 4379 -sV <host>
sudo nmap -sU -p 4379 <host>
nc -zv <host> 4379

Block it in the firewall

sudo ufw deny 4379/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4379" -Direction Inbound -LocalPort 4379 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4379 used for?

Port 4379 is assigned by IANA to ctdb (CTDB).

Is port 4379 TCP or UDP?

Port 4379 is registered for TCP and UDP.

Is it safe to open port 4379?

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 4379 is open?

On Linux run "ss -ltnup 'sport = :4379'", on macOS "lsof -nP -i :4379", and on Windows "netstat -ano | findstr :4379" to see the local process. From another machine, "nmap -p 4379 <host>" shows whether it is reachable.

05 Related
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