Ionic no access to the internet within the app

You need to add a plugin and a configuration to work this arround:

https://github.com/apache/cordova-plugin-whitelist

cordova plugin add cordova-plugin-whitelist

Add this to your config.xml in the root of the ionic project:

My problem was:

I was not able to communicate with my NodeJS (Express) backend within a normal AngularJS HTTP connection.

Also in the app included youtube videos could not be played.