Ember manual url change does not load page

I have an EmberJS application using Coffeescript and Ember 2.7.1.

I redirect the / to /student.

When I open my application, let's say on http://ift.tt/2bDsywu (yes, I need the ~somebody/dist part), it goes to http://ift.tt/2bI1RDT as expected.

I also have other pages, for example /settings. When I manually change the url from http://ift.tt/2bI1RDT to http://ift.tt/2bDsnRE, it doesn't load the page.

I get a Failed to load resource: the server responded with a status of 404 (Not Found) error.

The Settings router is "empty" (I didn't touch it) and the Student router returns now a hard coded json-like data as model. Both of them will fetch data from a server via Ember Data.

Any idea how to fix this?

My router.coffee file:

`import Ember from 'ember'`
`import config from './config/environment'`

Router = Ember.Router.extend
    location: config.locationType,
    rootURL: config.rootURL

Router.map ->
    @route 'student'
    @route 'settings'
    @route 'statistics'
    @route 'directory'

`export default Router`

My routes/index.coffee file:

`import Ember from 'ember'`

IndexRoute = Ember.Route.extend
  beforeModel: ->
      @transitionTo('student')

 `export default IndexRoute`

My environment.js file:

    /* jshint node: true */

module.exports = function(environment) {
  var ENV = {
    modulePrefix: 'something-frontend',
    environment: environment,
    rootURL: '/',
    locationType: 'auto',
    EmberENV: {
      FEATURES: {
        // Here you can enable experimental features on an ember canary build
        // e.g. 'with-controller': true
      }
    },

    APP: {
      // Here you can pass flags/options to your application instance
      // when it is created
    }
  };

  if (environment === 'development') {
    // ENV.APP.LOG_RESOLVER = true;
    // ENV.APP.LOG_ACTIVE_GENERATION = true;
    // ENV.APP.LOG_TRANSITIONS = true;
    // ENV.APP.LOG_TRANSITIONS_INTERNAL = true;
    // ENV.APP.LOG_VIEW_LOOKUPS = true;
  }

  if (environment === 'test') {
    // Testem prefers this...
    ENV.baseURL = '/';
    ENV.locationType = 'none';

    // keep test console output quieter
    ENV.APP.LOG_ACTIVE_GENERATION = false;
    ENV.APP.LOG_VIEW_LOOKUPS = false;

    ENV.APP.rootElement = '#ember-testing';
  }

  if (environment === 'production') {
      ENV.location = 'hash';
      ENV.rootURL = '/~somebody/dist'
  }

  return ENV;
};