Test Internet reachability for macOS Server
Reachability testing lets you know if clients for your services can access your server over the Internet.
The Server app securely sends network traffic to serverstatus.apple.com, and asks automated servers at Apple to try connecting to your server (from a 17.x.x.x IP address) for each service that’s enabled. Because Apple servers are outside your local network, they can simulate external clients trying to connect to your server. The results are shown in the Server app.
This service provides a reliable way to have an external source check your network connectivity. It’s frustrating when you believe everything is configured correctly, but you have no way to test the connections. This service gives you instant feedback about whether your configuration actually provides external accessibility.
You can see the following details:
The external IP address of your server
The public hostname of the server (the reverse-DNS entry for the external IP address)
The last time reachability was checked
The list of services found available to the Internet
Select your server in the Server app sidebar , then click Overview.
Click Details next to Internet.
Update the Last Checked time by clicking the refresh icon next to it.
For details about the tests, see the End User License Agreement (EULA). To find the EULA, click the Server menu, then select About Server. Finally, select License Agreement.