Connection refused on new EC2 Instance putty

Question

I\'ve created an instance of a server on EC2 based on an AMI generated from an existing server. All goes well during the create, and I specify the same key for the new server as

Answer 1

as you are taking the existing AMI you have to delete all the old entries from authenticated file except new entry. because while the coping the AMI old entries are still present in new instance so once you will delete it you may able to login into the instance.