title: Packer --debug produces the wrong ssh keypair
body: <p>I am trying to run packer with debug, but cannot ssh into my instance. Every attempt causes this error:</p>
  
  <pre><code>$ ssh -i ./ec2_amazon-ebs.pem centos@1.2.3.4 -vvvv
  ssh_exchange_identification: read: Connection reset by peer
  </code></pre>
  
  <p>I attempted to check this against the packer keypair by generating a new public key with:</p>
  
  <pre><code>ssh-keygen -y -f ./ec2_amazon-ebs.pem
  </code></pre>
  
  <p>I then added this in aws as a key pair and then compared the fingerprints.  They are different so packer seems to be either setting the wrong key in aws or giving me the incorrect private key. </p>