I can't access Reddit (and many other ordinarily safe websites, including Amazon and even Walmart, if you can believe that) on desktop because I keep getting an error that reads:

"An application is stopping Chrome from safely connecting to this site

"Fortinet" wasn't installed properly on your computer or the network:

• Try uninstalling or disabling "Fortinet"
• Try connecting to another network

NET::ERR_CERT_AUTHORITY_INVALID"

There's a box below that error message called ADVANCED, and when I click on it the following appears:

"Fortinet isn't configured correctly. Uninstalling "Fortinet" usually fixes the problem. Applications that can cause this error include antivirus, firewall, and web-filtering or proxy software"

The issue is that this started happening only a few hours ago. I've been using this network for almost two months now and I've never had this problem. I don't have Fortinet installed on my computer so I'm guessing this is a network issue.

What can I do? Any and all help is appreciated.