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I have raised this issue before and tried all suggested solutions to no avail. When I look at Norton history after I am locked out of my PC and have to restart, I see that there is always a 'firewall rules updated' and then 'your IP address has disappeared...'. I note that Win Defender firewall is ON and wonder if this could be an issue? I am running Win 10 v1803 and the updated Norton security deluxe v184.108.40.206. Any suggestions? Thanks.