Can't SSH as root into EC2 server - Please login as the user “ubuntu” rather than the user “root” [closed]

Answer 1

http://alestic.com/2009/04/ubuntu-ec2-sudo-ssh-rsync describes all the options available to you, and includes instructions for enabling SSH to root on EC2:

ssh -i KEYPAIR.pem ubuntu@HOSTNAME   'sudo cp /home/ubuntu/.ssh/authorized_keys /root/.ssh/'