Two NST probes can be configured for a VPN that tunnels the Remote Desktop Protocol (RDP) between a Terminal Services Server and a Microsoft Terminal Service Client (mstsc) across the public Internet. Figure 7.2, “Secure Virtual Computing With Microsoft Remote Desktop (RDP)” demonstrates a user at the Corporate Headquarter Site A running both a desktop session on a Windows XP Professional System and a Terminal Services session running Microsoft Word on a Windows Server 2003 which are both located at the remote Satellite Office Site B.

Figure 7.2. Secure Virtual Computing With Microsoft Remote Desktop (RDP)

Note that in this configuration NST probe A is allowing connections to the RDP VPN tunnels. This is accomplish by specifiying the "-g" command line option to the ssh command.