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The patch that Apple released to fix the "root" security flaw discovered in the latest release of macOS High Sierra is causing problems for some users.
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The patch -- which Apple rushed out in less than 24 hours -- can cause file sharing to stop working for some users, according to a support document published by Apple.
The fix itself is pretty straightforward, although does require users to be familiar with using Terminal:
Note that this fix is only for the file sharing bug caused by Security Update 2017-001 for macOS High Sierra 10.13.1. If you're running a different version, this patch isn't for you.
It's likely that Apple will push a patch for this bug as part of the macOS High Sierra 10.13.2 update.