Forticlient X509 - Verify Certificate Failed

“Oh no. My laptop’s clock must be wrong again.” She checks the time—it’s correct. She restarts FortiClient. Same error. The Investigation (Raj’s Remote Debugging) Maya calls Raj. He asks a series of questions:

Keep http://neverssl.com bookmarked. It forces any captive portal to show up without HTTPS interference. Forticlient X509 Verify Certificate Failed

“Are you on a public Wi-Fi?” Maya: “Yes, coffee shop.” Raj: “Does the coffee shop have a ‘login’ or ‘accept terms’ page when you connect?” Maya: “Yes, I had to click ‘Accept’ to their Wi-Fi policy.” “Oh no

Would you like a step-by-step checklist for this error on Windows vs. Mac? Forticlient X509 Verify Certificate Failed