Android : Connecting to .NET webservice from android application

I am trying to connect from android application with .NET webservice. I am using github.com/SignalR/java-client. I have almost no experience with Android and I cannot find solution to my problem. I tried to use these sample: github.com/SignalR/java-samples for implementing android client. In MainActivity.java I have method

public void buttonClick(View v)
    {
        HubConnection conn = new HubConnection("http://192.168.132.28:9000");

        // Create the hub proxy
        HubProxy proxy = conn.createHubProxy("HubClient");

        proxy.subscribe(new Object() {
            @SuppressWarnings("unused")
            public void messageReceived(String name, String message) {
                System.out.println(name + ": " + message);
            }
        });

        // Subscribe to the error event
        conn.error(new ErrorCallback() {

            @Override
            public void onError(Throwable error) {
                error.printStackTrace();
            }
        });

        // Subscribe to the connected event
        conn.connected(new Runnable() {

            @Override
            public void run() {
                System.out.println("CONNECTED");
            }
        });

        // Subscribe to the closed event
        conn.closed(new Runnable() {

            @Override
            public void run() {
                System.out.println("DISCONNECTED");
            }
        });

        // Start the connection
        conn.start()
                .done(new Action<Void>() {

                    @Override
                    public void run(Void obj) throws Exception {
                        System.out.println("Done Connecting!");
                    }
                });

        // Subscribe to the received event
        conn.received(new MessageReceivedHandler() {

            @Override
            public void onMessageReceived(JsonElement json) {
                System.out.println("RAW received message: " + json.toString());
            }
        });

        // Read lines and send them as messages.
        Scanner inputReader = new Scanner(System.in);

        String line = inputReader.nextLine();
        while (!"exit".equals(line)) {
            proxy.invoke("send", "Console", line).done(new Action<Void>() {

                @Override
                public void run(Void obj) throws Exception {
                    System.out.println("SENT!");
                }
            });

            line = inputReader.next();
        }

        inputReader.close();

        conn.stop();
    }

This method is invoked when button is pressed. But when I press the button I get an exception microsoft.aspnet.signalr.client.transport.NegotiationException: There was a problem in the negotiation with the server I use this webservice for testing. Here is full log from logcat (after pressing button). I disabled my firewall for testing. I tried to connect to server on my local computer and later on remote server. In both cases I have the same exception. I appreciate any suggestions.

P.S. I apologize for not using https in links to github, but new users are only allowed to create 2 links.