RDP Session (via the Gateway IP/DNS – Port number)
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We can use mstsc with a PORT number and RDP into a RDPlus Application / Gateway Server.
However, if we use these advanced Security tools located the RDPlus Admin Console on the Gateway Server, by going on the Security tile/tab, then clicking on the Advanced Security options tile…:
…the access is denied when trying to connect with RDP. To avoid this behavior, on the Gateway Server, you will have to do the following:
Go to Gpedit.msc, then under Computer Configuration, click on the Administrative Templates folder, on the Windows Components folder and on Remote Desktop Services:
Then, click on the Remote Desktop Connection Client folder, double-click on the “Allow .rdp files from unknown publishers” setting and enable it, as well as the “Configure server authentication for client”:
Under the Remote Desktop Client menu, click on the Remote Desktop Session Host folder, then on the Security folder. Enable the “Require user authentication for remote connections by using Network Level Authentication” setting.