'Datastream to Oracle Database - Connection Timeout

I am trying to establish a connection from the Datastream console to the Oracle database in the Oracle Cloud (OCI). I have already created a VPN tunnel it seems to be working since I connected to the same database by VM in the GCP. But when I try to connect through the Datastream it fails with a timeout connection error. Please the screenshot image

I am using a private connection and in this case the IP range (/29) used by Datastream, we opened in the OCI firewall.

As well, I tested the connectivity used reverse proxy and happened upon the same problem. I saw in the VM instance with the proxy configured (used tcpdump) that the connection returned to GCP, but showed the same error in the Datastream. In the logging, I saw an error message:

 "com.google.apps.framework.request.StatusException: 
    <eye3 title='INVALID_ARGUMENT'/> generic::INVALID_ARGUMENT:
      "in the API call "google.cloud.datastream.v1alpha1.Datastream.DiscoverConnectionProfile".

Is there a way I can solve this?



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