title: EC2 after restart can not access via ssh
body: <p>I was connecting my ec2 instance via ssh well,after adding new EBS volume restarted the machine by 'sudo shutdown -r now'</p>
  
  <p>And after that I tried to access by using follwing command:</p>
  
  <pre><code>ssh -v  -i primary_key.pem ubuntu@ec2-23-22-245-160.compute-1.amazonaws.com
  </code></pre>
  
  <p>which is retuning like below:</p>
  
  <pre><code>OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011
  debug1: Reading configuration data /Users/caveman/.ssh/config
  debug1: Reading configuration data /etc/ssh_config
  debug1: Applying options for *
  debug1: Connecting to ec2-23-22-245-160.compute-1.amazonaws.com [23.22.245.160] port 22.
  debug1: Connection established.
  debug1: identity file primary_key.pem type -1
  debug1: identity file primary_key.pem-cert type -1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1
  debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH*
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_5.6
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: server-&gt;client aes128-ctr hmac-md5 none
  debug1: kex: client-&gt;server aes128-ctr hmac-md5 none
  debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024&lt;1024&lt;8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
  debug1: Host 'ec2-23-22-245-160.compute-1.amazonaws.com' is known and matches the RSA host key.
  debug1: Found key in /Users/caveman/.ssh/known_hosts:31
  debug1: ssh_rsa_verify: signature correct
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug1: SSH2_MSG_NEWKEYS received
  debug1: Roaming not allowed by server
  debug1: SSH2_MSG_SERVICE_REQUEST sent
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug1: Authentications that can continue: publickey
  debug1: Next authentication method: publickey
  debug1: Trying private key: primary_key.pem
  debug1: read PEM private key done: type RSA
  debug1: Authentications that can continue: publickey
  debug1: No more authentication methods to try.
  Permission denied (publickey).
  </code></pre>
  
  <p>What is wrong?Any point that I am missing?</p>