I imported HDP 2.5 to the latest VirtualBox.
It installed fine.
However, when I try to SSH, it gives me "Connection Refused".
I have no idea how to proceed.
I look forward to your suggestions.
best answer to this is to change the root password in splash screen once you enter Alt+F5 and then use passwd to change the new password for root if a system doesn't ask for new password.
And use the new password to login via putty or any client.