I've got a terrible problem on a running webserver. It's a webserver running on CentOS, one of the default Amazon EC2 AMI's (images). I've been able to ssh to the server and do my thing until now. After a 'yum update' a sudo command from the ssh user (the standard user 'ec2-user') needs a password. I can't find a way to perform sudo operations now, and I can't find the default password either. I've never changed the password, so it should be the default value.
Does anyone now the default password, or a solution? SSH'ing as root does not work.