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Stop Chromium from listening on UDP Port 5353

Setting chrome://flags/#device-discovery-notifications to "disabled" as well as the configuration line export CHROMIUM_FLAGS="$CHROMIUM_FLAGS --media-router=0" in a file under /etc/chromium.d/ do not prevent the Chromium browser from listening on UDP port 5353 any longer. Instead, a policy has to be defined under /etc/chromium/policies/managed/:

$ mkdir -p /etc/chromium/policies/managed
$ echo '{ "EnableMediaRouter": false }' > /etc/chromium/policies/managed/disable_mediarouter.json

For Google Chrome, this policy has to reside under /etc/opt/chrome/policies/managed/.