Use the Server Manager to select the server instance.
Choose the Preferences tab.
Click the Restrict Access link.
Choose the ACL file to edit.
Pick the entire server resource, and click Edit Access Control.
Add a new rule to deny access to all.
Add another new rule to allow access to a specific group.
Enter a wildcard pattern for the host names of the computers to be allowed.
For example, *.employee.sun.com
Submit and Apply your changes.