title: disconnected: no supported authentication methods available (server sent: publickey, gssapi-with-mic)
body: <p>I don't know what is happening. </p>
  
  <p>I have been able to connect to the server for a couple of days without problems and suddendly I got a frozen window using putty. After that, each time I try to connect, I receive this message: </p>
  
  <pre><code>disconnected: no supported authentication methods available (server sent: publickey, gssapi-with-mic)
  </code></pre>
  
  <p>I am using putty and puttyagent for private key. I already have uploaded the public key to the server and I was able to connect half an hour ago.</p>
  
  <p>How can I check why it is failing? I haven't change the user or password or anything.</p>