Ok people, I've got what i'm sure is a total noob issue but this is the first time i've tried setting up captive portal.
I've got a guest ssid setup to use captive portal and users can connect to it fine but they get the following pop-up:
I have very limited experience with certificates. I understand the concept of them but haven't really used them and don't fully understand the application of them. I am in need of help.