Hi, I'm new to Spotify and I have a Premium account. My problem is that the wifi at home does not work on my device (Samsung Note 5), it says I have no connection. It works perfectly when I'm on my mobile data. I read the troubleshooting about this and maybe I have to open port 4070 in IP range 184.108.40.206/21 and 220.127.116.11/21 but I have no clue (not even in my instructions) how to deal with the "/21" prefix. My router is: Alcatel Lucent 7130. Any other solution will be appreciated.