Net Guard monitors every incoming connection to your Windows PC and blocks risky connections to keep your personal information secure. When you try to browse to a website that you believe is trustworthy, you are blocked from accessing the site by the McAfee Firewall function called Net Guard.
This function uses a repository of known good and known bad domain names and IP addresses. If you try to go to a known bad website or address, Net Guard protects you by blocking the connection.
The program permissions are to determine which programs can access the Internet, and which type of access they have. You can allow programs to have incoming and outgoing access, outgoing-only access, or no access at all.
The McAfee programs which need access to the internet is determined as Yes in Net Guard
Please review our article which will help you to know more about Net Guard.
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