I keep getting pop-up message on my iPhone 13 telling me it Cannot Verify Server Identity

You can fix the issue by going to your Calendar app, finding the calendar with the subscription link to data. nba. net or stanza, and unsubscribing from it For steps you can refer to this guide: Fix Cannot Verify Server Identity on iPhone. 

I had an old Detroit Pistons (UGH) schedule in my calendar. Open calendar and at bottom you'll find "Calendars". Tapped on that and found Pistons schedule. Deleted it and hopefully that fixes it for me.

I too started to recieve same error. The date of issued for cert is 5/21/25 source of cert says www.turner.com

This started after updating to latest IOS 17.5.1.

I removed all apps that use NBA, Turner broadcasting and Warner broadcasting to see if issue stopped and did not.

Going to try removal of NBA team schedule from calendar as others suggested to see if that stops the very not trusted error.

Here are the additional details of the untrusted cert.

The schedule calendar subscription had the data.nba.net for the subscribed link.

Same thing is happening to me. So annoying. Has anyone found a fix?

thanks

100% the same.

nothing I do is resolving the problem

Thank You Brother. That’s popup was driving me crazy!! Even my super computer brilliant mega millionaire brother couldn’t fix!!!

After removing Facebook app problem hasn’t returned. There’s been reports that Facebook app includes a VPN that reads all web traffic.

Seems odd the behavior stopped after removing Facebook app.

Do you have Facebook app installed?

Following because I am having the exact same issue

Me too. Very annoying.

I need help with that thing

Omg thank you!!!!