Global Protect config problem: The server certificate is invalid.

Sometimes, corporate firewalls or ISP-level proxies intercept HTTPS traffic and replace the certificate. and try to connect. If it works on cellular but not on home Wi-Fi, your ISP or home router is interfering.

In cybersecurity, the smallest oversight in identity verification can shut down an empire faster than any virus.

Open a web browser and navigate to your VPN portal address (e.g., https://example.com ).

Sync your system clock.