title: Bad local forwarding specification while connecting to cluster
body: <p>I am connecting to a data cluster and following these steps:</p>
  
  <p>(I obviously have my .ssh/config file set up properly)</p>
  
  <ol>
  <li><p>Open the tunnel</p></li>
  <li><p>SSH into the cluster</p></li>
  <li><p>Try to bind a port to the server so I can use a Jupyter notebook through this command: <code>ssh -N -L 22127:localhost:22127 [cluster_name]</code></p></li>
  <li><p>Run the ipython command on the cluster through: <code>ipython notebook --ip=127.0.0.1 --port=22127 --no-browser</code></p></li>
  </ol>
  
  <p>In the end, on step 3, I always get a "Bad local forwarding error". Please note that I have people next to me who have the exact same commands and configurations on the .ssh/config file and can connect and run the Jupyter server.</p>