title: Tramp can not connect to remote server
body: <p>I have upgraded my emacs and updated some el-get packages including tramp (my system is a bit old, and I could not upgrade some emacs packages), and now I can not use tramp to connect to a remote server:</p>
  
  <pre><code>Tramp: Opening connection for server1 using ssh...failed
  byte-code: Host `server1' looks like a remote host, `ssh' can only use the local host
  </code></pre>
  
  <p>I am using tramp version 2.2.13-pre and emacs version 24.5.1. I have compiled emacs myself, in case it matters.</p>
  
  <p>What can be going wrong? What could I try?</p>
  
  <h2>EDIT</h2>
  
  <p>I am calling tramp like this:</p>
  
  <pre><code>C-x C-f /user@server1:filename
  </code></pre>