Cannot connect to Windows 2008 R2 Server via WyseS10 dumb terminal

To whom it may concern

I have a strange problem at one of my clients.  When trying to connect via Wyse S10 dumb terminal, it would hang on screen as per attachment (RDP Connection Hang).  So no RDP session opens.

What I tried:
Connect via my laptop with RDP on same address and port and it will open the remote desktop session and I am able to log on.  

I can make a new connection on the dumb terminal to another Windows 2008 R2 server and it will connect without a problem.

Address that I use to connect:
129.205.133.147:3391
(RDP Connection Properties attachment, the attachment did cut off on the address, but the port is 3391)
Wyse Terminal System Settings:
(System Information attachment)

Server details that I connect to:
Windows Server 2008 R2 Standard 64-bit
Intel Xeon E5670 @ 2.27GHz
8GB Ram

Attached Remote Desktop Licensing Server Screen
(License Manager on Windows Server 2008 R2 Standard)

Server runs Kaspersky 10 Endpoint Security (Cloud version)

The terminals worked before, but after Kaspersky installation and reboot, the terminals did not want to connect.  This has been tested local on the network and now via the Public IP address.

Please advise and assist to sort out the problem and get the dumb terminals to connect via RDP to the server.

Please let me know if you require further details.

Kind Regards

Lourens
System-information.jpg
RDP-Connection-properties.jpg
RDP-Connection-Hang.jpg
License-Manager-on-Windows-Server-20.jpg