The first thing to confirm is that your Android device uses the same WiFi as your computer and that you have the WiFi enabled and working (without the Fiddler Everywhere proxy).
Also, you are using the blog post written for Fiddler Classic, which uses a different port. If you are using Fiddler Everywhere, then the default port of the FIddler proxy is 8866. Detailed Fiddler Everywhere configuration for Android can be found in the following documentation article: https://docs.telerik.com/fiddler-everywhere/get-started/mobile-traffic/configure-android
I already set up 8866 as my port, too. Same
Wondows cmd: $ ipconfig
tells me following
IPv4-Adresse . . . . . . . . . . : 192.168.147.99
Subnetzmaske . . . . . . . . . . : 255.255.255.0
Standardgateway . . . . . . . . . : 192.168.147.116
Which of these IP addresses do I use an Android side proxy settings? The Port is set to 8866 as mentioned.
Given that both the Windows PC and the Android device are on the same network, you should use 192.168.147.99 with port 8866 as manual proxy on your mobile device.
I followed this tutorial to capture traffic from an Android device: https://www.telerik.com/blogs/how-to-capture-android-traffic-with-fiddler
I've installed Fiddler Everywhere on my Windows 10 Pro 64bit machine.
Unfortunately, my Android device tells me that it does not have a connection to the internet.
I followed every step in that tutorial. So what am I missing?
Thanks in advance