I just became aware of this. Essentially Windows 10 is automatically (unless you opt out) sharing all of your WiFi passwords with all of your contacts on facebook, outlook, etc, so they can automatically log into the network you are on at any given time. From what I am reading, the only way to opt out is to rename your goddamned SSID with the _optout suffix. Have they lost their collective minds? Is there really nothing short of renaming my SSID, I as a network owner can do to prevent Windows 10 devices from letting other Windows 10 devices access my network? This is is absolutely horrifyingly bad. I can't believe this is actually real. it sounds like a bad joke. A real betrayal of trust. How are you guys dealing with this? As far as I am concerned my network is my network, and is private. Only people I intentionally an explicitly allow to connect to it are allowed in. It makes me wonder if there is away I can universally block ALL Windows 10 devices from my network. Maybe if I by default block all mac addresses except those I have explicitly let through? Maybe if I add a password protected captive portal? I might just have to disable WiFi permanently and revert to an all wired network. Any ideas? I should NOT have to change my SSID to stop Windows from sharing my network password with anyone I have tangentially connected with online.