Fix an “Unapproved Caller” SecurityAgent Message in Mac OS X
Rarely, Mac users may encounter a random error message which appears somewhat disconcerting, with an OS X pop-up message saying “Unapproved caller. SecurityAgent may only be invoked by Apple software.”
This message can appear at random when using certain apps, or after logging in or a reboot, and is sometimes followed by crashing and other bad behavior. Because the message is vague and mentions SecurityAgent and an ‘unapproved caller’ many users perceive this to be some sort of eavesdropping or attack event, but the good news is that is not the case, and you can fix the error message quite quickly and you will likely never see it again.