Get Block Internet Access From Hosts File Background. The hosts file allows the computer to look up other computer names, like localhost, or domain names, like helpdeskgeek.com that means anything before your communication connects to the internet. In addition to your network configuration, the file can be used to define a domain=ip address pairing which will have priority above the value provided by the dns server.

I did read somewhere that it might have something to do with security features on my system.

The world of internet is a pool of numerous websites which has turned everything digital. This will lock down your hosts file and prevent anyone or any malware from writing to it. Blocking internet access for programs is also a good way to prevent automatic updates. You'll need a file manager.