title: undertow webserver not binding to remote address
body: <p>I'm testing out the undertow 2.0.0.Alpha1 webserver. When I run it locally it works and returns <code>Hello World</code> when I go to <code>localhost:80</code>. I then deploy the webserver on a remote server and go to <code>remote_ip:80</code> but I get no response back. If I run <code>curl -i -X GET http://localhost:80</code> on the remote server then I get <code>Hello World</code> back as well. So the server is definitely running but for some reason it's just not accessible via the remote ip address. If I try to set a hostname as the remote IP in the code (i.e. <code>.addHttpListener(80, "remote.ip")</code>) then I get a <code>BindException</code>.</p>
  
  <pre><code>import io.undertow.Undertow;
  import io.undertow.server.HttpHandler;
  import io.undertow.server.HttpServerExchange;
  import java.io.IOException;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  public class HelloWorldServer {
  
      public static void main(final String[] args) {
          try {
              Runtime.getRuntime().exec("sudo fuser -k 80/tcp");
          } catch (IOException ex) {
              Logger.getLogger(HelloWorldServer.class.getName()).log(Level.SEVERE, null, ex);
          }
          Undertow server = Undertow.builder()
                  .addHttpListener(80, null)
                  .setHandler(new HttpHandler() {
                      @Override
                      public void handleRequest(final HttpServerExchange exchange) throws Exception {
                          exchange.getResponseSender().send("Hello World");
                      }
                  }).build();
          server.start();
      }
  
  }
  </code></pre>
  
  <p>Any clues?</p>