"Cannot Verify Server Identity" alert on iOS device - how to find source?

Solution 1:

Look in the settings app, delete all profiles you don’t know you need and maybe the rest.

Also, VPN profiles could be implicated and for an edge case, look to any iCloud keychains on macOS.

I would make a back up as well in case you end up erasing the contents and settings and restoring from backup after being sure it’s not coming from your network with a clean iOS device that joins your network.

Solution 2:

I suddenly began seeing this same pop-up alert all over my iOS device.

Had no idea what was causing it and was afraid my network had somehow been hacked.

It ended up being a shared iCal Calendar that I had joined. The sport event that I had join the calendar for ended, and the calendar creator must have then made some kind of change to their site.

Check any shared iCloud Calendar that you have joined. I deleted the calendar and have not seen the alert since.

Cannot Verify Server Identity

The identity of "123kid.in" cannot be verified. Review the certificate details to continue.

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