Today’s fix for Apple’s nasty root account bug has broken file sharing for some users, including on my iMac. Apple has published a fix, and I assume this will be resolved in a future, less critical software update:
- Open the Terminal app, which is in the Utilities folder of your Applications folder.
sudo /usr/libexec/configureLocalKDCand press Return.
- Enter your administrator password and press Return.
- Quit the Terminal app.