See also [HINTS and TIPS] and [HOWTOS] for other subjects.
See also http://www.simplehelp.net/2007/11/07/screenshot-simulation-os-x-105-leopard-network-settings/ (third-party).
Go Apple logo >> System Preferences >> Network.
In the OSX 10.5 Network preference pane:
Network preferences now includes various features that were previously either hidden (e.g. in other preference panes) or only available from the command line (e.g. duplicating services, importing and exporting configurations, managing virtual interfaces, etc.). The "Advanced" button provides access to these additional features.
In Tiger, the firewall controls were on a sub-tab under System Preferences >> Sharing. With Leopard, they are under System Preferences >> Security:
By default, the Leopard firewall is set to "Allow all incoming connections". Also, you can only use the + control to add applications. This means that you cannot craft specific rules for individual ports as you could with Tiger, and that when an application is running you will see prompts asking you to permit communications for the application.
Go Apple logo >> System Preferences >> Sharing.
In OSX 10.5 the Sharing preference pane is refined and expanded. The screen below shows the new GUI pane for sharing specific folders.
Nearly every service has some new feature, usually in the form of more flexibility about who can use the service.
The new guest account feature allows anyone to login without a password.
The usual set of constraints can be applied to the guest account, including the so-called "parental controls" that severely restrict access. A temporary home directory is created when a guest user logs in. The user id is always the same (201), and only one guest can be logged in at a time. There's no fear of one guest seeing another guest's left-over files because the entire home directory is deleted upon logout. A warning is provided.
Last updated 2008-01-22.