Websites (including apple.com) won’t open — the device says it does not trust the certificate.

Check Your Device's Date and Time (Most Common Fix)

The most frequent cause of this error is an incorrect date or time on your device. Web browsers use the system clock to verify that a website's security certificate is still valid and not expired. If your clock is wrong, the browser may incorrectly think the certificate is either expired or not yet valid.

Fix:

• Set Date and Time to Automatic: Go into your device's settings and ensure that the date, time, and time zone are set to update automatically using the network.
  • On iPhone/iPad: Go to Settings > General > Date & Time. Turn on Set Automatically.
  • On Mac: Go to Apple Menu () > System Settings (or System Preferences) > General > Date & Time. Turn on Set date and time automatically.
  • On Windows: Go to Settings > Time & language > Date & time. Turn on Set time automatically.

Restart your device after making the change, then try accessing the website again.

If the date and time are correct, try these general troubleshooting steps:

• Update Your Browser/OS: Ensure your web browser (Chrome, Safari, Firefox, etc.) and your device's operating system (iOS, macOS, Windows, Android) are fully up to date. Older software may not have the latest list of trusted Certificate Authorities (CAs).
• Clear Browser Data: Clear your browser's cache, cookies, and history. Stored data can sometimes interfere with security checks.
• Try a Different Browser: Test the site on a different browser (e.g., if you're using Safari, try Chrome). If it works on a different browser, the issue is with your primary browser's settings.

In some cases, the error can be caused by something intercepting or filtering your secure connection:

• VPN/Proxy/Firewall: Temporarily disable any VPN, proxy service, or strict third-party firewall/antivirus software. Some security tools "inspect" secure connections, which can break the certificate chain and cause this error.
• Public Wi-Fi: If you're on public Wi-Fi (like a coffee shop or airport), they sometimes use an outdated "captive portal" that can cause certificate issues. Try connecting via a different network (like cellular data) to see if the problem goes away.
• Reset Network Settings (Use as a Last Resort): This will erase all saved Wi-Fi passwords and network preferences, but can fix deep network-related errors.
  • On iPhone/iPad: Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.