Access the Server Manager for the server instance.
On the Preferences tab, click the Administer Access Control link.
Select the entire server from the drop-down list, click Select, and then click the corresponding Edit button.
The Access Control Rules For page is displayed.
Add a rule to deny access to all.
Add another rule to allow access to a specific group.
Use From Host to specify the host names and IP addresses you want to restrict.
Click Submit to save your changes.