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// Other services

Port 9390: OpenVAS Transfer Protocol

Port 9390 is assigned by IANA to otp (OpenVAS Transfer Protocol).

9390

How otp works

Other services
client:9390otpresponse client:9390otpresponse

The client sends a request to port 9390 and the otp 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 9390 dangerous?

We have no specific security note for port 9390. 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 9390

ServicePortTransportDescriptionReferenceUpdated
otp 9390 TCP OpenVAS Transfer Protocol - 2008-12-24
-9390-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9390, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9390'      # process listening on 9390
sudo lsof -nP -i :9390

macOS

sudo lsof -nP -i :9390

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9390 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9390
netstat -ano | findstr :9390

From another machine

nmap -p 9390 -sV <host>
nc -zv <host> 9390

Block it in the firewall

sudo ufw deny 9390/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9390" -Direction Inbound -LocalPort 9390 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9390 used for?

Port 9390 is assigned by IANA to otp (OpenVAS Transfer Protocol).

Is port 9390 TCP or UDP?

Port 9390 is registered for TCP.

Is it safe to open port 9390?

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 9390 is open?

On Linux run "ss -ltnup 'sport = :9390'", on macOS "lsof -nP -i :9390", and on Windows "netstat -ano | findstr :9390" to see the local process. From another machine, "nmap -p 9390 <host>" shows whether it is reachable.

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