Posted 06 February 2015 - 11:07 AM
The Windows 8 firewall settings you refer to are for listening ports, e.g. incoming connections. The programs you mention don't need this kind of access.
These programs need outgoing connections, but those are not automatically blocked by the Windows firewall. So these programs can update their signatures without the need for a specific firewall configuration.
By default, Windows Firewall allows all outbound network traffic
SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
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