Brian, Have a look @ this link (https://support.avg.com/answers?id=906b0000000D3pjAAC).
AVG Guru
I can't connect to my ChromeCast unless I disable AVG, then connect to my ChromeCast device from my laptop, and then re-enable AVG. What can I do so that AVG does not block ChromeCast and I can use ChromeCast without disabling AVG?
Brian, Have a look @ this link (https://support.avg.com/answers?id=906b0000000D3pjAAC).
AVG Guru