Sorry to be vague. I blocked various domains that the TV wanted to use in order to send data back, eg. ichnaea.netflix.com collect-eu-fy2017.myhomescreen.tv x2

Sorry to be vague. I blocked various domains that the TV wanted to use in order to send data back, eg. ichnaea.netflix.com collect-eu-fy2017.myhomescreen.tv x2.vindicosuite.com But it is allowed to access other domains such as: nrdp.prod.ftl.netflix.com api-global.netflix.com vcs.vdspf.com push.prod.netflix.com uiboot.netflix.com appboot.netflix.com auth-ctv.digitaluk.co.uk c09.api.freeviewplay.net secure.netflix.com Nothing on the network other than the Pi can get out of port 53 (DNS).