GETTING ERROR Connection refused: connect for guacamole driven application

Hello I am creating guacamole driven application and getting error java.net.ConnectException: Connection refused: connect. I tried the code given in guacamole web application documentation getting java.net.ConnectException: Connection refused: connect error

servlet code

@WebServlet
public class HttpTunnelServletController extends GuacamoleHTTPTunnelServlet {

    private static final long serialVersionUID = 1L;
    public static SimpleGuacamoleTunnel tunnel = null;
    @Override
    protected GuacamoleTunnel doConnect(HttpServletRequest request)
        throws GuacamoleException {

        // Create our configuration
        GuacamoleConfiguration config = new GuacamoleConfiguration();
        config.setProtocol("rdp");
        config.setParameter("hostname", "104.197.255.190:8080/guacamole");
        config.setParameter("port", "3389");
        config.setParameter("password", "guacamole");

        // Connect to guacd - everything is hard-coded here.
       GuacamoleSocket socket = new ConfiguredGuacamoleSocket(
                new InetGuacamoleSocket("localhost", 4822),
                config
        );  
        // Return a new tunnel which uses the connected socket
        return new SimpleGuacamoleTunnel(socket);
    }
}

web page

<div class="col-sm-9 col-md-6 col-lg-8 col-xl-10">
        <span class="border">
            <form action="/GuacamoleHTTPTunnelServletController" >
              <!-- Guacamole -->
        <script type="text/javascript"
            src="guacamole-common-js/all.min.js"></script>

        <!-- Display -->
        <div id="display"></div>




        <!-- Init -->
        <script type="text/javascript"> /* <![CDATA[ */

            // Get display div from document
            var display = document.getElementById("display");

            // Instantiate client, using an HTTP tunnel for communications.
            var guac = new Guacamole.Client(
                new Guacamole.HTTPTunnel("/tunnel")
            );

            // Add client to display div
            display.appendChild(guac.getDisplay().getElement());
            
            // Error handler
            guac.onerror = function(error) {
                alert(error);
            };

            // Connect
            guac.connect();

            // Disconnect on close
            window.onunload = function() {
                guac.disconnect();
            }

        /* ]]> */ </script>  <!-- Guacamole -->
        <script type="text/javascript"
            src="guacamole-common-js/all.min.js"></script>

        <!-- Display -->
        <div id="display"><a href="tunnel">URL</a></div>

        <!-- Init -->
        <script type="text/javascript"> /* <![CDATA[ */

            // Get display div from document
            var display = document.getElementById("display");

            // Instantiate client, using an HTTP tunnel for communications.
            var guac = new Guacamole.Client(
                new Guacamole.HTTPTunnel("tunnel")
            );

            // Add client to display div
            display.appendChild(guac.getDisplay().getElement());
            
            // Error handler
            guac.onerror = function(error) {
                alert(error);
            };

            // Connect
            guac.connect();

            // Disconnect on close
            window.onunload = function() {
                guac.disconnect();
            }

        /* ]]> */ </script>
                
            </form>
        </span>
      
    </div>
  </div>
</div>
  </div>
   <!-- Init -->
        <script type="text/javascript"> /* <![CDATA[ */

            // Mouse
            var mouse = new Guacamole.Mouse(guac.getDisplay().getElement());

            mouse.onmousedown = 
            mouse.onmouseup   =
            mouse.onmousemove = function(mouseState) {
                guac.sendMouseState(mouseState);
            };

            // Keyboard
            var keyboard = new Guacamole.Keyboard(document);

            keyboard.onkeydown = function (keysym) {
                guac.sendKeyEvent(1, keysym);
            };

            keyboard.onkeyup = function (keysym) {
                guac.sendKeyEvent(0, keysym);
            };

        /* ]]> */ </script>

What else configuration need to be done. Thanks in advance

There is a configuration issue in the Java code. The GuacamoleConfiguration object should have the configuration of the target machine (windows) you are connecting to.

In your case, you are using the RDP protocol, so the hostname should have the address of the Windows machine you want to connect to. The username and password for the target windows machine are mandatory when RDP protocol is used. If you are using a domain user, you should also specify the domain parameter.

I believe the basis of your code is from the Guacamole example. This example explains how to connect to the VNC server, which does not require a username. In general, the basic configuration for connecting to windows should look like this:

    // Create our configuration
    GuacamoleConfiguration config = new GuacamoleConfiguration();
    config.setProtocol("rdp");
    config.setParameter("hostname", "104.197.255.190"); // IP or fqdn of the windows machine, no URL
    config.setParameter("port", "3389");
    config.setParameter("username", "some-windows-user");
    config.setParameter("password", "some-windows-user-password");
    config.setParameter("domain", "windows-domain-if-exists");