My t1.micro instances are starting to get CPU maxed out on a fairly regular basis so I'm having a play with a t2.medium with a view to running a few on it. I've got one mnode up and running and it is purring like a kitten.
Wait wait!! as long as you fail to log in with SSH dont continue with the other steps!
Tell me please, what is the exact name and location of the .pem file in your linux file system!?