Everytime that you connect to a remote computer with your Mac OS X, you are given the option of being a registered user or a guest. Fortunately or unfortunately, anyone in your network will have access to your computer via guest access.

Even if this only gives the user access to the drop box, they will still have the ability to place files inside your computer without any consent from you. Anyone, reading this and nodding their heads saying it sounds familiar, then just follow these guide from Rhett Frei, on how to disable the guest account in Mac OS X.

Step 1: Look for com.apple.AppleFileServer.plist under /Library/Preferences. After you've already located it, hold down option and drag the file to your desktop. Then, you'd have to move it again to another folder, say Documents. This will serve as your backup.

Step 2: If you have a .plist editor at your disposal, double click on com.apple.AppleFileServer.plist to open the file. If not you can download  PlistEdit Pro located below this article.

Step 3: Turn down the arrow  Root in the Property List column and when you find guestAccess, change its value from yes to no.

Step 4: Save (cmd-S) your work on the file and Quit (cmd-Q)

Step 5: Hold down Option and drag com.apple.AppleFileServer.plist from the Desktop back into /Library/Preferences. Once you've done that you can now dispose of copies that are on your desktop and in the Documents folder.

Download: [PlistEdit Pro]