Summary The “Cannot Verify Server Identity” error on your iPhone can be frustrating, but with the right approach, it’s usually easy to fix.

To correct the cannot verify server identity error, the first thing you should do is check that your iPhone is displaying the correct time and date and force quit the Mail application on your phone.

That’s the case with an alert that can appear when an app or the operating system “Cannot Verify Server Identity” in iOS or iPadOS or “can’t verify the identity of the server” in macOS.

While browsing using mobile safari (latest version of iOS) I keep getting constant popups 'cannot verify server identity'.