Programs do not have access to the network, Avast, DropBox, GoogleDrive What could be the reason?

Question

Network administration

Browsers, messengers normally go online.
On the example of Avast: if the network cable is not connected at all or the connection has not yet been established, then at least think a little before giving an error:
The online content is unavailable
Please, check your internet connection and try again.
if the connection is normal for other applications, it immediately gives an error without thinking for a moment.
Braudmamaman (you will break the language) Windows is disabled, it costs from Comodo, I turn it off. I also turn it off from autorun.
what I tried: I
reinstalled DropBox, the installation is in progress, it downloads data from the Internet, but at startup it already says in the tray that it no longer sees the Internet
Tried to go online through another Internet (mobile) the same
I looked through the list of tasks for strange processes, killed the extra ones I
booted in the minimal mode msconfig->Diagnostic launch
I launched all the fixes from the NetAdapterRepair1.2.exe utility. i.e. reset DNS, hosts and much more standard

Answer 1

First, I would look at the contents of the file /windows/system32/drivers/etc/hosts