In order to maintain a secure environment, Remote Display uses SSH. The Remote Display Server, which runs on the remote host, allows only RFB (Remote Frame Buffer) connections from and to the remote host. No incoming access to the Server is allowed, and the Server can connect back to the Viewer only over an established SSH connection. In addition, only one Viewer connection is allowed to the Server.
As Remote Display connects to systems, a password is required. If you are allowed to use keyless ssh, you can simplify the connection process. Check with your system administrator to confirm that this kind of connection is allowed and the ssh documentation for how to generate and store key information.