title: "ssh example.com" hangs but "ssh example.com bash -i" does not
body: <p>everyday I encounter a very strange phenomenon.</p>
  
  <p>From my university internet connection, sshing to my machine ("ssh example.com") works without any problems. </p>
  
  <p>From my home adsl, "ssh example.com" my console gets stuck with this message: </p>
  
  <pre><code>debug1: Server accepts key: pkalg ssh-rsa blen 533
  debug1: Enabling compression at level 6.
  debug1: Authentication succeeded (publickey).
  debug1: channel 0: new [client-session]
  debug1: Requesting no-more-sessions@openssh.com
  debug1: Entering interactive session.
  </code></pre>
  
  <p>Sometimes it might let me in but in most of the cases not.
  The funny thing is that if I execute "ssh example.com bash -i" I get logged in immediately.</p>