From the DualShield's point of view, Parallels (2X) Remote Application Server (RAS) is an authentication agent. In order for Parallels (2X) server to work with DualShield server, you need to first register your Parallels (2X) server with your DualShield server.
First, enable the Agent Auto Registration function in your DualShield server. In the DualShield Management Console, select "Authentication | Agents" and click the "Auto Registration" button on the tool bar:
You may want to enable the "Check IP" option for extra security.
Log into your Parallels (2X) Remote Application Server Console