Quick question... there is an option in the OS X Firewall to open Port 123 for NTP (date and time service). Is this only necessary for making the Mac a NTP SERVER, or is it also necessary for the Mac to be a client? It seems like the former. I noticed my port was open, and from what I can tell, there's no reason for it to be, and it doesn't seem to open automatically when you enable NTP in the Date & Time prefs (i.e. it isn't open, but greyed out, like the Web Server port is, when you have Personal Web Sharing on -- in that case, you are not able to close the port unless you first turn off web sharing). Thanks!