Because Apple has recently released an update that successfully closes this Mac OS High Sierra gap. Unfortunately, one bug is eliminated, but another is introduced. Because with the recent emergency fix the file release of MacOS was shot. On Twitter, there were numerous complaints.
A little later, Apple released a support document that describes how to solve the new problem, but you have to open the terminal app and enter commands manually. Because you have to enter “sudo / usr / libexec / configureLocalKDC” (without quotation marks) and confirm the entry via administrator password.
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According to various responses on Twitter (via The Guardian ), it is completely unacceptable for some users to have to enter manual commands via the terminal, “because of Apple’s incompetence”. Others were more pragmatic, arguing that closing a serious gap justifies a “manageable loss.”