Selecting Block All Incoming Connections does not disconnect your computer from the internet. Even in this mode, you can still use your browser to connect to the internet. Similarly, other outbound connections—whether they're legitimate services or some sort of spyware—continue unabated . If you really want to sever your ties to the outside world, open Network And Sharing Center and disable each network connection. (Alternatively, use brute force: physically disconnect wired network connections and turn off wireless adapters or access points.)
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