@Batuhan Tüter For #1, the key should be the private key you use to ssh from sandbox (ambari-server host) to vagrant VM. In case its not yet setup, you may use "ssh-keygen -t rsa" to setup a keypair for ssh login For #2, from sandbox see if firewall is running (service iptables status). If yes, stop and retry the ping check. The other option would be to check the virtual networking on the two VMs - are they pointing to the same Virtual switch etc.? -Vivek ... View more