To manually install a RAS Secure Gateway and add it to the Farm, follow these steps:
Log into the server where you'll be installing the RAS Secure Gateway using an administrator account.
Copy the Parallels RAS installation file (RASInstaller.msi) to the server and double-click it to launch the installation wizard.
Follow the onscreen instruction and proceed to the installation type page. Select Custom and click Next.
Click on RAS Secure Gateway in the feature tree and select Entire Feature will be installed on local hard drive.
Ensure that all other components in the selection tree are cleared and click Next.
Click Install to start the installation.
When the installation is completed, click Finish to close the wizard.
Open the RAS Console and specify the RAS Connection Broker that will manage the gateway.