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Suppose I have a program which needs to connect to the Internet in order to work. Let's also say that I only want this program to communicate on private networks, so I add a firewall rule allowing it to communicate on private connections.
If I don't want it to work on public connections, should I explicitly add a new blocking firewall rule or would Windows Firewall automatically block the traffic on public networks for this program (i.e. following a whitelist approach, where everything is blocked by default)?
user1301428
Posted 2013-04-09T08:43:13.303
Reputation: 2 985
Depends on the specific program. Most programs don't need a firewall rule to work. – Ramhound – 2013-04-09T11:07:46.117
@Ramhound I know, I was referring to programs which need a firewall rule to work – user1301428 – 2013-04-09T11:25:56.737
Are you talking about outbound connections, where the program connects to a server on the internet, or inbound connections, where a machine on the internet connects to the program? – Harry Johnston – 2013-04-12T05:00:02.267
@HarryJohnston both :) – user1301428 – 2013-04-14T12:21:37.247
By default, outbound connections are a blacklist, and inbound connections are a whitelist. But that's configurable. – Harry Johnston – 2013-04-14T22:53:44.063
@HarryJohnston thanks! Where can I configure the general behavior? – user1301428 – 2013-04-18T23:03:23.377