title: TensorBoard could not bind to port 6006, it was already in use
body: <p>I already closed the Tensorboard before, but after I open new terminal and re-run the command <code>tensorboard --logdir /tmp/retrain_logs</code>, it produces following error: </p>
  
  <blockquote>
    <p>E0128 12:24:08.469702 MainThread program.py:201] TensorBoard could not
    bind to port 6006, it was already in use</p>
    
    <p>E0128 12:24:08.469702 140707008960320 program.py:201] TensorBoard
    could not bind to port 6006, it was already in use</p>
    
    <p>ERROR: TensorBoard could not bind to port 6006, it was already in use</p>
  </blockquote>
  
  <p>Anybody knows the how could this happen? I can easily restart the PC, but now I'm in the middle of training my dataset (unfortunately I haven't set checkpoint) so I don't want to terminate it.</p>