title: Can't SSH Into EC2 Instance
body: <p>So I spun my instance up from the web, downloaded a keypair installed it and everything worked great for about a day. Then I rebooted my computer, and I'm not able to SSH into it anymore. I tried redownloading a keypair and reinstalling it but I keep getting the Permission denied (publickey) error.</p>
  
  <p>This is the verbose output (I've tried using the -i /path/to/keypair option as well with no luck):</p>
  
  <pre><code>debug1: Reading configuration data /etc/ssh_config
  debug1: Applying options for *
  debug1: Connecting to ec2-184-73-218-40.compute-1.amazonaws.com [184.73.218.40] port 22.
  debug1: Connection established.
  debug1: identity file /Users/tigger/.ec2/domainpolish type 1
  debug1: identity file /Users/tigger/.ec2/domainpolish-cert type -1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3p1 Debian-3ubuntu7
  debug1: match: OpenSSH_5.3p1 Debian-3ubuntu7 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 'ec2-184-73-218-40.compute-1.amazonaws.com' is known and matches the RSA host key.
  debug1: Found key in /Users/tigger/.ssh/known_hosts:11
  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: Offering RSA public key: /Users/tigger/.ec2/domainpolish
  debug1: Authentications that can continue: publickey
  debug1: Offering RSA public key: domainpolish
  debug1: Authentications that can continue: publickey
  debug1: No more authentication methods to try.
  Permission denied (publickey).
  </code></pre>
  
  <p>I've also tried rebooting the instance. Anyone have anything else I can try? Thanks so much!</p>