** Update 28 April 2021: I experienced the same(?) bug again today on a new M1 MBP with macOS 11.3 and was able to resolve the problem with the steps described below.
It has been a long while since I wrote something on this page. For the past days, since I upgraded my MacBook Pro to macOS Cataline 10.15.1, I have been struggling with a very annoying issue. I have not been able to log in to the new Apple Music and Apple TV apps to enjoy the subscription services that I pay for. I have now found a solution that is a good workaround for me so I want to share this with the internet and other people who struggle with the same problem as I did. No re-installation or new account creations is required!
*update: Wednesday, 2 March 2016. Switched back to the hosts file from http://someonewhocares.org/ because that one has a more adequate size and therefore much better performance. The file from hosts-file.net uses to much memory if you run a local resolver on your machine.
*update: Wednesday, 17 February 2016 rewrote the script with additional error checks after comment from Peter. Now there is only one script with the hosts file from http://hosts-file.net
*update: Tuesday, 16 February 2016 added another script that also cleans OS X 10.11 DNS caches and uses an even more extensive hosts file from http://hosts-file.net
Recently I compared adblock+, ghostery and a bunch of other ad blocking software in the browsers that I normally use. Most of them blocked ads really well but unfortunately all of them added quite a lot of additional CPU and memory overhead. So, despite the fact that these programs help me to speed up my browsing experience by eliminating advertisements they still slow down my browsing experience.