"Cannot Verify Server Identity" - Cannot find source I'm getting an odd error suddenly and presumably due to an old certificate that I probably accepted many years ago when I used to use Adium on macOS via iMessage / Messages.  Suddenly, just today, I started getting the following popup in all sorts of apps on iOS 13 on my iPad and iOS 13 on my iPhone:



Since I can’t determine if this message come from the front most app or system settings I’ll need some help with how I can locate what setting or app is calling a site that no longer has a signed certificate that iOS trusts.

What steps can triage this?
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.