system
3
The problem seems to be that Avast is constantly blocking svchost.exe (Host Process for Windows services) in my desktop computer, which is required for the hotspot to work (1st screen shot).
But in fact, svchost.exe has already been allowed to make all connections in Application Rules (2nd screen shot).
Trying to solve this, I deleted the rule and set Avast to ask me about how to handle svchost.exe (3rd screen shot).
It did ask me, and I chose to allow all connections (4th screen shot).
But it did not work either.