My iMac is dual-boot, meaning it can start up in either macOS or Windows 10. I mostly use the now-outdated Windows 10, but yesterday I switched to macOS to learn app programming. While using macOS, I was prompted to upgrade to the latest version of the operating system. I accepted the upgrade, which took about an hour. Everything worked fine afterward, both in macOS and when I switched back to Windows 10.
However, after leaving my computer in "sleep" mode overnight, I found in the morning that Windows 10 could no longer access the Internet. My other computer and my phone could connect without any problem.
I tried the obvious fixes — rebooting the gateway (router) and restarting the computer a couple of times — but nothing worked. When I switched to macOS, it connected to the Internet just fine. Then I set up a hotspot on my phone, and Windows 10 was able to access the Internet through that, which told me it wasn't a hardware issue and likely not a problem with the gateway.
I suspected that upgrading macOS might have caused the Boot Camp drivers used by Windows to become outdated. So, in macOS, I formatted a flash drive and used Boot Camp Assistant to copy the latest drivers onto it. Then I rebooted into Windows and reinstalled the drivers.
Initially, that didn't seem to help. I was about to call Comcast technical support, but I decided to reboot the gateway one more time. For a few seconds after restarting it, the Internet still didn't work — and then suddenly, Windows connected.
Apparently, the fix was a combination of updating the Boot Camp drivers and rebooting the gateway.
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