Looking at my firewall page, I see that my current network is blocked and that this network and the other 4 listed as recent networks are all described as untrusted.
The settings for each of them invites me to trust them and, in the case of the current network, I'm invited to unblock it.
The settings for my current network also reveal it to be a Local Area Connection whose Internet Service Provider is BT. As a btinternet.com subscriber, this does not surprise me and I wonder what possible risk there can be to unblocking it. It looks like the only network I've ever used
I don't know how to check that my firewall is set to private. There is a blizzard of choices within "view firewall rules", so some guidance on this might be helpful, particularly if I'm likely to face this problem again.
Thank you so much for sticking with me on this. Happy Christmas. ... Chris