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High Sierra File Sharing Error

File Sharing sometimes fails in macOS High Sierra after installing Security Update 2017-001. This should fix it...

Open the Terminal application (in Utilities folder, inside Applications folder).
Enter this command: sudo /usr/libexec/configureLocalKDC
Hit the return key.
Enter your administrator password to authenticate with sudo.
Quit out of Terminal.

Now try an AFP or SMB file sharing connection, which should now work.