Update App.js

public/App.js

@@ -3,7 +3,7 @@
 	var terrainProviderViewModels = [];
 	 terrainProviderViewModels.push(new Cesium.ProviderViewModel({
         name : 'Flat',
-        iconUrl : Cesium.buildModuleUrl('https://w2.iaf.hft-stuttgart.de/CesiumData/Images/TerrainProviders/Ellipsoid.png'),
+        iconUrl : Cesium.buildModuleUrl('https://w2.iaf-ex.hft-stuttgart.de/CesiumData/Images/TerrainProviders/Ellipsoid.png'),
         creationFunction : function() {
             return flatterrain;
 			}
@@ -352,10 +352,10 @@ geocoder.search();}
 
    
 	var building = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 
-	'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Buildings/BuildingSolid/LKRLudwigsburg/tileset.json'}));
+	'https://w2.iaf-ex.hft-stuttgart.de/CesiumData/3DTiles/Buildings/BuildingSolid/LKRLudwigsburg/tileset.json'}));
 
 	var roofsurface = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 
-	'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Buildings/RoofSurface/LKRLudwigsburg/tileset.json'}));
+	'https://w2.iaf-ex.hft-stuttgart.de/CesiumData/3DTiles/Buildings/RoofSurface/LKRLudwigsburg/tileset.json'}));
 	var roofdefaultstyle = new Cesium.Cesium3DTileStyle({color : "color('#990000')"});
 		roofsurface.style = roofdefaultstyle;
       // set roof height and load roof tile 
@@ -370,7 +370,7 @@ geocoder.search();}
 					console.log(error);
              });
 			roofsurface.show =true;
-	var landuse = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Landuse/LKRLudwigsburg/tileset.json'}));
+	var landuse = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 'https://w2.iaf-ex.hft-stuttgart.de/CesiumData/3DTiles/Landuse/LKRLudwigsburg/tileset.json'}));