Android studio - Application closes when I try to access a server bd

I'm working with android studio , create an application which allows me to read data from a database on a server and load the data into the sqlite database that has android .

When I do it in my genymotion emulator everything is fine, I have a samsung tablet with android 5.1.1, I install the application and I get a perfect connection (I can read the data from the web and load it in sqlite).

The problem is when I try to install on another tablet with android 5.1.1, in these cases when I try to read from the web the application closes. Any idea why it does not work on the other tablets? I need to have installed some package or apk on the tablet that does not work?

Part of the code

public JSONObject makeHttpRequest(String url, String method,
                                      List params) {

        // Making HTTP request
        try {

            // check for request method
            if(method.equals("POST")){
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();

            }else if(method.equals("GET")){
                // request method is GET
                DefaultHttpClient httpClient = new DefaultHttpClient();
                String paramString = URLEncodedUtils.format(params, "utf-8");
                url += "?" + paramString;
                HttpGet httpGet = new HttpGet(url);
                //httpGet.addHeader("Cookie", "__test=06410fea214b2febfb23d387de6037da; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/");
                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }


        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();System.out.println(e.getMessage());
        } catch (ClientProtocolException e) {
            e.printStackTrace();System.out.println(e.getMessage());
        } catch (IOException e) {
            e.printStackTrace();System.out.println(e.getMessage());
        }
        catch(Exception e){
            e.printStackTrace();System.out.println(e.getMessage());
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;

            while ((line = reader.readLine()) != null) {

                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {

            jObj = new JSONObject(json);

        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}


 protected String doInBackground(String... args) {
            BaseHelper baseHelper = new BaseHelper(MyActivity.this, "DEMODB", null, 1);
            //Elimino todos los datos de la tabla producto (base sqlite tablet)
            baseHelper.vaciarTabla("producto",baseHelper);

            // Building Parameters
            List params = new ArrayList();
            // getting JSON string from URL
            JSONObject json = jParser.makeHttpRequest(urlProductos, "GET", params);

            // Check your log cat for JSON reponse
            Log.d("All Products: ", json.toString());

            try {
                // Checking for SUCCESS TAG
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    // products found
                    // Getting Array of Products
                    products = json.getJSONArray(TAG_PRODUCTS);

                    // looping through All Products
                    //Log.i("ramiro", "produtos.length" + products.length());
                    for (int i = 0; i < products.length(); i++) {
                        JSONObject c = products.getJSONObject(i);

                        // Storing each json item in variable
                        String id = c.getString(TAG_ID);
                        String codigo = c.getString(TAG_CODIGO);
                        String nombre = c.getString(TAG_NOMBRE);
                        String lista = c.getString(TAG_LISTA);
                        String preciou = c.getString(TAG_PRECIOU);
                        String preciobr = c.getString(TAG_PRECIOBR);
                        String stock = c.getString(TAG_STOCK);
                        String fecha = c.getString(TAG_FECHA);

                        System.out.println(id+" "+codigo+" "+lista+" "+nombre);

                        // inserto en mi tabla local
                        SQLiteDatabase db = baseHelper.getWritableDatabase();
                        if (db != null) {
                            ContentValues registroNuevo = new ContentValues();
                            //primer parametro nombre en la base, segundo el valor a ingresar
                            registroNuevo.put("prd_id", id);
                            registroNuevo.put("prd_codigo", codigo);
                            registroNuevo.put("prd_nombre", nombre);
                            registroNuevo.put("prd_lista", lista);
                            registroNuevo.put("prd_precio_u", preciou);
                            registroNuevo.put("prd_precio_br", preciobr);
                            registroNuevo.put("prd_stock", stock);
                            registroNuevo.put("prd_fecha_update", fecha);
                            long z = db.insert("producto", null, registroNuevo);
                        }

                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }