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I was trying to turn off my Macbook Pro and suddenly got this message. As far as I know, there's no reason why this should be happening. Anyone want to fill me in on some possibilities?

enter image description here

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up vote 4 down vote accepted

Apparently, you've enabled File Sharing in the Sharing section of System Preferences. Someone on your network has connected to your computer, either as a registered user or as a guest.

Unless this kind of access is absolutely required, it's good security practice to disable both File Sharing and the Guest user in System Preferences -> Sharing and System Preferences -> Accounts and Groups, respectively.

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For Lion, it was in "Users & Groups" under "System" and "Sharing" under "Internet & Wireless" in the System Preferences. Thanks though. It's much appreciated. – Dante Sep 5 '11 at 19:25

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