MR JACK C MILLER

I put the IP into putty and launch the black CMD screen i type in the username root but the password it doesnt let me type in or if i shift insert enter it just says access denied. After a long while it says Putty fatal error remote side unexpectantly closed network connection. Anyone know? this will be my first node of 25 and really stuck on why it is denying my access to the racknerd server, i am using the IP address and password in the email which comes alongside the root username. Is there a...