title: Cloning git repo causes error - Host key verification failed. fatal: The remote end hung up unexpectedly
body: <p>I am using SSH to clone a git repo to my web server, but every time I get this error</p>
  
  <pre><code>$git clone git@github.com:aleccunningham/marjoram.git
  Cloning into marjoram...
  Host key verification failed.
  </code></pre>
  
  <p>I have tried almost everything that has shown up in Google searches, and I am dumbfounded on why this will not work. Any ideas?</p>
  
  <p>Also, I am not using anything like Jenkins.</p>