Block a program’s internet access with Windows 8 firewall
If you have some peculiar program installed that you need to have but want all its internet communication blocked you can do that easily with Windows' built in firewall. On Windows 8 just hit the Windows key to get to the main menu and
- type Firewall.
- Click on Settings on the right pane and
- go to Windows Firewall.
- Click on Advanced settings on the left side of the window.
- On the left pane of the new window, right-click on Outbound Rules and
- select New rule...
Now follow the setup wizards few steps to set the rule up. That's it! If you happen to need to deactivate the rule for a short time, you can just right-click it and do so: