title: Unable to register docker selenium remote node to selenium hub remote host with docker
body: <p>I'm trying to connect the <code>docker selenium remote node</code> to <code>remote docker hub</code>, But it's not connecting, it shows the connection refused exception in Grid console(<code>http://localhost:4444/grid/console</code>) as in below screeshot.</p>
  
  <p>Grid Screenshot:</p>
  
  <p><a href="https://i.stack.imgur.com/zYNdp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zYNdp.png" alt="enter image description here"></a></p>
  
  <p>The command I used to run the Hub on Machine A:
  Hub:</p>
  
  <pre><code>docker run -d -p 4446:4444 --name selenium-hub -P selenium/hub
  </code></pre>
  
  <p>and command I used to register Node in Machine B on same network is:</p>
  
  <pre><code>docker run -d -e HUB_PORT_4444_TCP_ADDR=10.7.30.9 -e HUB_PORT_4444_TCP_PORT=4444 selenium/node-firefox-debug:latest
  </code></pre>
  
  <p>But getting an error like this:</p>
  
  <pre><code>DefaultRemoteProxy unknown version,Connect to 172.17.0.2:5555 [/172.17.0.2] failed: Connection refused (Connection refused)
  </code></pre>