We have a group of instances in an Amazon VPC we use for our live environment.

We have a big release to do and want to test that the deployment will run smoothly.

I have created a second VPC, created instances of the same size on the same private ips and then removed their original volumes and attached new volumes that were created from snapshots of the live environment.

Unfortunately none of the instance will allow me to connect. They start running fine, but I don't get any system logs appear and can't connect.

The only thing I can think of is that the new instance was created from a new AMI as the old one is deprecated due to new security fixes.

Is this a problem? If so can I fix it in any way? And if this isn't a problem, does anyone have any ideas how I can fix it?