If you know the application, allow it to make the connection if you don’t, tell the firewall to block it.

After you install Comodo Firewall, when an application needs to make an Internet connection, the firewall will ask whether you want to allow that connection. Once you’re in the program, things get more straightforward. At defaults, you could end up with bundled products and a new home page (more on that later). Installing the program is a complicated affair that requires close attention. You can always change the level of protection later, when you’re running the program. The higher the level of protection, the greater the intrusiveness of the firewall, so you’ll have to balance protection against annoyance when making your choice. When you install Comodo Firewall, you’re given a choice of whether to install only the basic firewall, the “Firewall with Optimum Proactive Defense” (which also protects against malware which can bypass firewalls), or the Firewall with Maximum Proactive Defense+, which does what “Firewall with Optimum Proactive Defense” does, plus protecting against “leaks”–information about things such as open ports on your PC being sent out over the Internet.

Comodo firewall without antivirus