Starting a service makes it available to users on your network, and stopping a service makes it unavailable.
In the Server app sidebar, select the service you want to start.
Click the On/Off switch to turn on the service.
If a dialog asks whether you want to allow Internet access to the service you turned on, click Allow to configure your AirPort device and make the service accessible to Internet users.
Click Don’t Allow if you don’t want the service to be accessible to computers on the Internet, or if you’re not sure. You can change Internet access to services later by selecting your AirPort device in the Server app sidebar. For more information, see Manage AirPort port mapping and Wi-Fi login.
The dialog appears only if your AirPort device is listed in the Server app sidebar and you turned on a service that the Server app can manage on your AirPort device. These services include Calendar, Contacts, Mail, Messages, and Websites.
If you have an Internet router that isn’t listed in the Server app sidebar, you can configure it to allow Internet access to services. This process is called port forwarding or port mapping. For information, see Router port mapping.
Stopping a service makes it unavailable to users on your network. Configuration preferences remain intact after you stop a service.
In the Server app sidebar, select the service you want to stop.
Click the On/Off switch to turn off the service.