For example, If I check for updates in VirtualBox(it could be any application), I get this prompt:
Then I click the Deny Button, and I get this window :
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So far so good, but if I decide to create a rule from the prompt window and then click the Deny button, ESET Firewall will allow the the existing connection to connect to the remove site and only start blocking the existing connection if I check for updates again.
I was expecting that ESET Firewall would block the existing connection right away. I mean, in this example nothing bad will happen to your computer, but if the application is some kind of malware trying to call home, ESET firewall will allow the existing connection to connect.