Hi @Shelton    I followed your suggestion and modified HOSTS file in the C:\Windows\System32\drivers\etc on my Windows 7 machine where the VirtualBox/Sandbox is installed, it still prompts me the 502 error.   Here are the hosts file: 127.0.0.1 localhost ::1 localhost 127.0.0.1 sandbox.hortonworks.com sandbox   I used the Windows7 built-in Resource Monitor to inspect which application is using 8080, and it shows VirtualBox: Since VirtualBox is where the sandbox resides, there is no way for me to terminate it. How do I then access Ambari from localhost?   Thank you very much if you can kindly help me to sort it out at your earliest convenience.     ... View more