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// Databases & caches

Port 6789: GSS-API for the Oracle Remote Administration Daemon

Port 6789 is assigned by IANA to radg (GSS-API for the Oracle Remote Administration Daemon).

6789

How radg works

Databases & caches
app:6789radg app:6789radg

The application sends a SQL query to the radg server on port 6789, which returns rows from its tables.

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
Databases & caches
01 Security

Is port 6789 dangerous?

We have no specific security note for port 6789. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 6789

ServicePortTransportDescriptionReferenceUpdated
radg 6789 TCP GSS-API for the Oracle Remote Administration Daemon - 2016-09-15
-6789-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6789, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6789'      # process listening on 6789
sudo lsof -nP -i :6789

macOS

sudo lsof -nP -i :6789

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6789 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6789
netstat -ano | findstr :6789

From another machine

nmap -p 6789 -sV <host>
nc -zv <host> 6789

Block it in the firewall

sudo ufw deny 6789/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6789" -Direction Inbound -LocalPort 6789 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6789 used for?

Port 6789 is assigned by IANA to radg (GSS-API for the Oracle Remote Administration Daemon).

Is port 6789 TCP or UDP?

Port 6789 is registered for TCP.

Is it safe to open port 6789?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 6789 is open?

On Linux run "ss -ltnup 'sport = :6789'", on macOS "lsof -nP -i :6789", and on Windows "netstat -ano | findstr :6789" to see the local process. From another machine, "nmap -p 6789 <host>" shows whether it is reachable.

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