title: ssh with private pem key not possible (dlopen image not found)
body: <p>Since this evening i can't connect to my AWS EC2 instances.
  It keeps telling me the following:</p>
  
  <pre><code>dlopen private.pem failed: dlopen(private.pem, 2): no suitable image found.  Did find:    private.pem: file too short
  </code></pre>
  
  <p>This is the output of my ssh connection:</p>
  
  <pre><code>'''ssh $SSHOPTS -I private.pem admin@54.213.238.233
  OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
  debug1: Reading configuration data /Users/evertvancauwenberg/.ssh/config
  debug1: Reading configuration data /etc/ssh_config
  debug1: /etc/ssh_config line 20: Applying options for *
  debug1: /etc/ssh_config line 53: Applying options for *
  debug1: Connecting to 54.213.238.233 [54.213.238.233] port 22.
  debug1: Connection established.enter code here
  dlopen private.pem failed: dlopen(private.pem, 2): no suitable image found.  Did find:
      private.pem: file too short
  debug1: identity file /Users/evertvancauwenberg/.ssh/id_rsa type 1
  debug1: identity file /Users/evertvancauwenberg/.ssh/id_rsa-cert type -1
  debug1: identity file /Users/evertvancauwenberg/.ssh/id_dsa type -1
  debug1: identity file /Users/evertvancauwenberg/.ssh/id_dsa-cert type -1
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_6.2
  debug1: Remote protocol version 2.0, remote software version OpenSSH_6.0p1 Debian-4
  debug1: match: OpenSSH_6.0p1 Debian-4 pat OpenSSH*
  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: Server host key: RSA 6f:80:22:e6:cd:c0:84:c4:1c:11:a8:bb:ee:55:2e:75
  The authenticity of host '54.213.238.233 (54.213.238.233)' can't be established.
  RSA key fingerprint is 6f:80:22:e6:cd:c0:84:c4:1c:11:a8:bb:ee:55:2e:75.
  Are you sure you want to continue connecting (yes/no)? yes
  Warning: Permanently added '54.213.238.233' (RSA) to the list of known hosts.
  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/evertvancauwenberg/.ssh/id_rsa
  debug1: Authentications that can continue: publickey
  debug1: Trying private key: /Users/evertvancauwenberg/.ssh/id_dsa
  debug1: No more authentication methods to try.
  Permission denied (publickey).
  </code></pre>
  
  <p>I'm working on OSX 10.9.2 
  with ssh -v </p>
  
  <p>OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011</p>
  
  <pre><code>usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]
             [-D [bind_address:]port] [-e escape_char] [-F configfile]
             [-I pkcs11] [-i identity_file]
             [-L [bind_address:]port:host:hostport]
             [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
             [-R [bind_address:]port:host:hostport] [-S ctl_path]
             [-W host:port] [-w local_tun[:remote_tun]]
             [user@]hostname [command]
  </code></pre>