I don’t know if it is related, but on 2020-07-17, I updated Windows to the May Update (v2004). At some point after about noon on the 18th (I only turned this computer on the morning of the 19th), I found I had lost connectivity to the network.
Running GlassWire 2.2.210. Firewall on and set to “Ask to connect”. When I turned off the GlassWire firewall, immediately data started flowing to/from the network. Flipped it back to ON and within about 5 minutes, all traffic to the Internet was being blocked. Flipped it back OFF and traffic immediately started flowing.
I wondered if there was something I had blocked that was causing this and so went to the firewall tab and removed everything that was in the “Blocked” section by clicking the “x” that appears when you hover over a lin of a blocked app and acknowledging that I will be promoted when the app next tries to access the network.
Tried flipping the firewall on and off and got the same effect as before. In a few instances (when the GlassWire firewall was ON), I would get a tab in Google Chrome that would report that it was unable to connect to the address and then it kept trying and sometimes it would connect 15 - 30 seconds later.
I saw some recent news reports that in Windows 10 v2004, sometimes the network status indicator in Windows will incorrectly report that access to the Internet has been lost - and even though it is lying, some programs believe that indicator and will refuse to even try to access the network. https://social.technet.microsoft.com/Forums/en-US/4c8654be-d3da-4611-a649-110ca5a7c70a/ncsi-taskbar-icon-may-report-quotno-internetquot-on-windows-10-2004-devices-that-do-have?forum=win10itpronetworking https://www.windowslatest.com/2020/07/18/windows-10-no-internet-connection-problem https://www.forbes.com/sites/gordonkelly/2020/07/20/microsoft-windows-10-upgrade-2004-may-2020-breaks-internet-connections-update-free-windows-10-update/#16fe2275a992
I have another computer at v2004 that does not have the problem I am experiencing on this computer.
The network status indicator on this computer never shows as having lost connectivity.
I am happy to remove GlassWire and do a clean reinstall if that’s the best approach, but I thought I would post here in case there is any value to be gained by trying other things, checking config, etc before I wipe out any evidence.