title: I try access via ssh the server
body: <p>I tried:</p>
  <pre><code>$ ssh root@157.245.238.190
  </code></pre>
  <p>and I receive:</p>
  <pre><code>Warning: Permanently added '157.245.238.190' (ECDSA) to the list of known hosts.
  Permission denied (publickey).
  </code></pre>
  <p>Why does the connection fails, even though I have added the server fingerprint to the <code>known_hosts</code> file?</p>
  <p><a href="https://i.stack.imgur.com/RUxFI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RUxFI.png" alt="screenshot ssh session" /></a></p>