Computer Configuration > Policies > Centrify Settings > Mac OS X Settings > Firewall > Enable iPhoto Sharing
On Mac OS X Servers, enabling this policy has no effect. If the firewall is enabled, the iPhoto Sharing service is not allowed through the firewall.
If the firewall is enabled, enabling this group policy is the same as clicking the On checkbox to allow communication through the firewall for iPhoto Bonjour Sharing. If you do not enable this group policy, traffic for iPhoto Bonjour Sharing will be blocked from the local computer. Users will be able to access iPhoto collections on other computers, but the local computer cannot be used to serve any iPhoto collections.
This policy can take effect dynamically at the next group policy refresh interval without rebooting the computer.