Thanks for your reply, Eddy.

It seems to me that svchost.exe is being blocked indeed. (screen shot 5)

I have already set all networks to “private” (screen shot 6)

And, after I turned on the mobile hotspot, I was notified that the Firewall mode had been changed to “Private/ Low risk zone” (screen 7). But as you can see in screen shot 5, the blocking of svchost.exe was related to “Public/ high risk zone”.