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Consider the scenario where your Terminal Services server is located behind a SonicWALL firewall on the LAN side and uses a private IP address; the administrator must setup this SonicWALL firewall to allow the Terminal Services server to be accessible from the Internet by remote users.
This video shows you exactly how to accomplish this task.
The SonicWALL firewall does the following:
To make the Terminal Services server accessible from the Internet the administrator must perform these configuration steps from SonicWALL’s management interface: