How to configure OS X to use the Content filter.

Local settings:

1. Open the Network control in System Preferences select the Proxy tab.
2. Set the Web proxy to localhost and the port to 8080
3. Set the Secure Web proxy to localhost and the port to 8080
4. Set the FTP proxy to localhost and the port to 3128
5. Set the Gopher proxy to localhost and the port to 3128
6. click apply now and lock the panel by clicking on the lock icon

To provide this service as a server for others.
Replace the word "localhost" with the IP of your server on the CLIENT machines.
Open ports 3128 and 8080 on your servers firewall.