December 31 is the last day to block requests from your Amazon-dash buttons to Amazon servers. In 2020 your buttons can be bricked in an update from Amazon servers. To continue using your buttons you must configure your router to block Internet connections from the buttons. Alternatively you can block these domains: dash-button-na-aws-opf.amazon.com
, 0.amazon.pool.ntp.org
, 1.amazon.pool.ntp.org
, 2.amazon.pool.ntp.org
, 3.amazon.pool.ntp .org
. However, it is recommended to block all requests from the buttons.