title: Why is this websocket connection being refused?
body: <p>I try to use the slack-sample bot from this blogpost <a href="https://www.opsdash.com/blog/slack-bot-in-golang.html" rel="nofollow">https://www.opsdash.com/blog/slack-bot-in-golang.html</a> . I've successfully created my api token, but i can not connect to the websocket server (the rtm.start request passs normally). I've get the error message</p>
  
  <blockquote>
  <pre><code>dial tcp 54.242.95.213:443: connectex: No connection could be made because the target machine actively refused it
  </code></pre>
  </blockquote>
  
  <p>I've also tried to connect via a chrome app called <strong>Simple Web Socket Client</strong> and via a website based one tester. Both work well, i can establish a connection and i can send data.</p>
  
  <p>I'm behind a proxy, but i only have troubles with golang's websocket.Dial function.</p>
  
  <p>Does anybody know why this can happen?</p>
  
  <p>I use:<br>
  - Windows 7 SP1 x64<br>
  - Golang 1.7.1 windows/amd64  </p>
  
  <p>Greetings
  Tonka</p>