Knox is not set up on the HDP cluster, or Ambari credentials are incorrect for 'seeded user' mode
This error occurs when the cluster is reachable, but authentication is failing.
Unable to connect, please retry. DataPlane could not retrieve cluster
Knox is not set up on the cluster.
The user wants to use the less secure 'seeded user' mode, but the credentials of the seeded user (user name or password) are not setup in DPS.
Validate that Knox is configured correctly as per documentation.
If seeded user mode is being used (for evaluation purposes), add the correct credentials to DPS using ./dpdeploy.sh utils update-user ambari.
See the dpdeploy.sh Script Command Reference.