Failed to open TCP connection
<p>While attempting to open a TCP connection to graph.facebook.com, I receive the following error:</p>

<blockquote>
  <p>Failed to open TCP connection to graph.facebook.com:443 (getaddrinfo:
  Name or service not known)</p>
</blockquote>

<pre><code>TCPSocket.open(conn_address, conn_port, @local_host, @local_port)
        rescue =&gt; e
          raise e, "Failed to open TCP connection to " +
            "#{conn_address}:#{conn_port} (#{e.message})"
        end
      }
</code></pre>

<p>Help me with this error</p>

<p>I'm using <code>omniauth</code> with Rails 5.0.0.beta3</p>