"your connection is not private" page across all my devices on this wifi

[dimond_dog888]

I'm getting the "your connection is not private" page across all my devices on this wifi, so is my roommate. Wtf. It's obviously not my browser or malware or any of the standard solutions because it's on ALLLLLLLLLL devices no matter what the website. so wtf is this? All internet is fucked. Help asap!!!

 

[Prostar Computer]

Do any of you have to enter a password to connect to your network?