Little Snitch is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The most popular Windows alternative is GlassWire, which is free.If that doesn't suit you, our users have ranked 25 alternatives to Little Snitch and 13 are available for Windows so hopefully you can find a suitable replacement. MDNSResponder issues on LAN with blocked DNS? At my office we recently blocked any access to external DNS servers and now require everyone to use our internal DNS. This is for a few reasons: we use internal DNS for intranet domains, it blocks outbound DNS reflection attack bots, etc.