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// Other services

Port 8379: Cruise DIAGS

Port 8379 is assigned by IANA to cruise-diags (Cruise DIAGS).

8379

How cruise-diags works

Other services
client:8379cruise-diagsresponse client:8379cruise-diagsresponse

The client sends a request to port 8379 and the cruise-diags 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 8379 dangerous?

We have no specific security note for port 8379. 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 8379

ServicePortTransportDescriptionReferenceUpdated
cruise-diags 8379 TCP, UDP Cruise DIAGS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8379, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8379'      # process listening on 8379
sudo lsof -nP -i :8379

macOS

sudo lsof -nP -i :8379

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8379 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8379
netstat -ano | findstr :8379

From another machine

nmap -p 8379 -sV <host>
sudo nmap -sU -p 8379 <host>
nc -zv <host> 8379

Block it in the firewall

sudo ufw deny 8379/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8379" -Direction Inbound -LocalPort 8379 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8379 used for?

Port 8379 is assigned by IANA to cruise-diags (Cruise DIAGS).

Is port 8379 TCP or UDP?

Port 8379 is registered for TCP and UDP.

Is it safe to open port 8379?

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 8379 is open?

On Linux run "ss -ltnup 'sport = :8379'", on macOS "lsof -nP -i :8379", and on Windows "netstat -ano | findstr :8379" to see the local process. From another machine, "nmap -p 8379 <host>" shows whether it is reachable.

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