Why do I see a security warning when I use VNC Viewer to connect to my Mac?

This is usually caused by connecting to Apple Screensharing/Apple Remote Desktop, or a non-RealVNC VNC Server.

We recommend subscribing to VNC Connect to get a much better experience. To get started, please see the below articles:

How do I get started with VNC Connect on Windows and Mac?

How do I get started with VNC Connect on Linux?