Computer Configuration > Policies > Centrify Settings > Mac OS X Settings > Internet Sharing > Disallow all Internet Sharing
Prevent any kind of Internet sharing on the local computer. Enabling this group policy is the same as clicking Stop to prevent other computers from sharing an Internet connection on a local computer in the Internet pane of the Sharing system preference.
For this group policy, clicking Disabled or Not Configured has no effect. If you have previously Enabled the group policy, Internet sharing will remain off until you manually start it on the local computer.
Once enabled, this group policy takes effect when users log out and log back in, or dynamically at the next group policy refresh interval without rebooting the computer.