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// Other services

Port 9339: gRPC Network Mgmt/Operations Interface

Port 9339 is assigned by IANA to gnmi-gnoi (gRPC Network Mgmt/Operations Interface).

9339

How gnmi-gnoi works

Other services
client:9339gnmi-gnoiresponse client:9339gnmi-gnoiresponse

The client sends a request to port 9339 and the gnmi-gnoi service answers.

Transport
TCP
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 9339 dangerous?

We have no specific security note for port 9339. 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 9339

ServicePortTransportDescriptionReferenceUpdated
gnmi-gnoi 9339 TCP gRPC Network Mgmt/Operations Interface - 2019-05-09
-9339-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9339, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9339'      # process listening on 9339
sudo lsof -nP -i :9339

macOS

sudo lsof -nP -i :9339

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9339 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9339
netstat -ano | findstr :9339

From another machine

nmap -p 9339 -sV <host>
nc -zv <host> 9339

Block it in the firewall

sudo ufw deny 9339/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9339" -Direction Inbound -LocalPort 9339 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9339 used for?

Port 9339 is assigned by IANA to gnmi-gnoi (gRPC Network Mgmt/Operations Interface).

Is port 9339 TCP or UDP?

Port 9339 is registered for TCP.

Is it safe to open port 9339?

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 9339 is open?

On Linux run "ss -ltnup 'sport = :9339'", on macOS "lsof -nP -i :9339", and on Windows "netstat -ano | findstr :9339" to see the local process. From another machine, "nmap -p 9339 <host>" shows whether it is reachable.

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