If you are going to play with the hosts files I would copy the contents and paste into another txt file before changing anything.. This way you can always put it back...
Give this a try Zamora 25
Open CMD (command prompt) Admin and RUN below command one by one.
ipconfig /release
ipconfig /all
ipconfig /flushdns
ipconfig /renew
netsh int ip set dns
netsh winsock reset
Now Restart your computer to get rid of the ERR_CONNECTION_REFUSED error.