@K Aleksandra As @Sonu Sahi said, you are adding some complexity by using the Sandbox. Having said that, the default Sandbox container does not expose port 8670 (Ambari Agent) and ports 8440/8441 (Ambari Server ports). You have to expose these 3 ports on the Sandbox for the agent to be able to talk to the Sandbox. You can refer to my article on how to expose ports on the Sandbox: https://community.hortonworks.com/articles/65914/how-to-add-ports-to-the-hdp-25-virtualbox-sandbox.html ... View more