title: dash app refusing to start: '127.0.0.1 refused to connect.'
body: <p>I am trying to run the example dash application but upon trying to run, the browser says it is refusing to connect. I have checked and Google Chrome has access through the firewall.</p>
  
  <p>The example code is: </p>
  
  <pre><code>import dash
  import dash_core_components as dcc
  import dash_html_components as html
  
  external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
  
  app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
  
  app.layout = html.Div(children=[
  html.H1(children='Hello Dash'),
  
  html.Div(children='''
      Dash: A web application framework for Python.
  '''),
  
  dcc.Graph(
      id='example-graph',
      figure={
          'data': [
              {'x': [1, 2, 3], 'y': [4, 1, 2], 'type': 'bar', 'name': 'SF'},
              {'x': [1, 2, 3], 'y': [2, 4, 5], 'type': 'bar', 'name': u'Montréal'},
          ],
          'layout': {
              'title': 'Dash Data Visualization'
          }
      }
  )
  ])
  
  if __name__ == '__main__':
      app.run_server(debug=True)
  </code></pre>
  
  <p>Here is a picture of my browser:</p>
  
  <p><a href="https://i.stack.imgur.com/XAs8k.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/XAs8k.jpg" alt="enter image description here"></a></p>
  
  <p>Does anyone understand this?</p>