Everything was working for me on 5th Feb. I did the big windows update to W10 1809 on 16th Feb. I started trying to connect to Calibre with CC on my new phone and found the problem with both it and the old phone on 6th March. So it MIGHT be the update, which was within the window for when the problem started - but it's a month wide window.
I have already gone through every setting I can find for security and sharing, but found nothing that make any difference. I am still, as it was before, on a private network with discovery and sharing enabled. I CAN access, from the phone over wifi, those locations and files on my laptop that are set to sharing or are within my user directory, using the 'Remote Locations' feature in File Explorer + which I think is using SMB (it's using port 445) - and that includes the Calibre directory and its contents. So it is not that nothing on my phone can access the laptop. I haven't managed to get Solid Explorer to connect, though, which specifically says 'LAN/SMB'. and it is not just CC that can't connect to Calibre on the laptop - FBReader can't find the server, and trying to access the Calibre server with Chrome on the phone doesn't work either.
Comodo's KillSwitch Network Connections monitor show Calibre listening on ports 8080 and 9090, and my browsers on the laptop can access the server without trouble. There may well be some setting that needs changing, but I just can't find what it is.
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