Windows Firewall is blocking my attempt to allows Docker for Windows to share C: on windows 10 machine.
Works fine when Windows Firewall off. When its on I get
I had the same problem with firewall not allowing me to share my C drive. I tried all listed above solutions and nothing worked for me. Then I uninstalled docker completely from my machine Control Panel\Programs\Programs and Features ->
select Docker for Windows -> Uninstall
Then go to docker website and click Get Docker for Windows (Stable)
After that I was able to share drive C