Check if whitelist plugin is installed and if the tag <allow-navigation href="*"/>
Is present on the config.xml file.
On the index.html file paste this line inside <head> tag: <meta http-equiv="Content-Security-Policy" content="default-src *; script-src 'self' 'unsafe-inline' 'unsafe-eval' *; style-src 'self' 'unsafe-inline' *">
Check if you have these permissions in AndroidManifest.xml (platforms->android->AndroidManifest.xml) <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />