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clivech
clivech
New Member
February 13, 2026
Question

Google calendar server not trusted

  • February 13, 2026
  • 1 reply
  • 148 views
My phone keeps telling me the server for google.calendar.com is not trusted. The certificate is apparently valid through 2056. What is going on and how do I prevent this message from recurring endlessly on my iPhone?

 

1 reply

Stephen_G
Moderator
Stephen_G
Moderator
February 16, 2026

Hi clivech,

 

I got the following advice - please let me know if it helps:

 

1. Check Date and Time Settings

Ensure that your iPhone's date and time settings are correct. Incorrect settings can cause certificate validation issues.

  • Go to Settings > General > Date & Time.
  • Enable Set Automatically if it's not already enabled.

2. Update iOS

Make sure your iPhone is running the latest version of iOS, as updates often include security fixes and improvements.

  • Go to Settings > General > Software Update.
  • If an update is available, download and install it.

3. Clear Safari Cache

Clearing the cache can sometimes resolve certificate issues.

  • Go to Settings > Safari.
  • Tap Clear History and Website Data.

4. Check Certificate Trust Settings

If you have manually installed certificates, ensure they are trusted:

  • Go to Settings > General > About > Certificate Trust Settings.
  • Ensure that any relevant certificates are enabled under ENABLE FULL TRUST FOR ROOT CERTIFICATES.

5. Reinstall the Profile

If you are using a configuration profile that includes certificates, try reinstalling it:

  • Go to Settings > General > VPN & Device Management.
  • Remove the existing profile and reinstall it if necessary.

6. Contact Support

If the issue persists, consider contacting Apple Support or your IT department (if applicable) for further assistance.

Stephen_G - Fortinet Community Team
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