In Little Snitch’s configuration screen, we set iTunes to deny connections to the Internet radio while still allowing access to the iTunes Store. In Safari, all websites are allowed except for www.pandora.com. 

The Internet speed at my office slows down tremendously when my employees are streaming music through iTunes Radio and pandora.com. Is there any way to block my employees from streaming music on their Macs?

You could invest in a hardware-based content filtering firewall such as the Barracuda Web Filter (starting at $1,499, www.barracudanetworks.com), which blocks the users on your network from accessing websites that you specify based on domain name or category. It can also prevent applications, such as iTunes, from accessing the Internet.

For a software-based solution, there’s Little Snitch ($29.95, www.obdev.com), which informs you whenever a program attempts to establish an outgoing Internet connection (letting you know the specific port and IP address that your application is trying to access) and lets you block those attempts. You can prevent apps from accessing the entire Internet or just certain websites. Best of all, you can lock Little Snitch to prevent users from making changes to the settings that you’ve customized.