Remote App - Because of a protocol error this session will be disconnected

Hello,
We have an environment where we connect to our server in a different network location to access our ERP system. On this server, we have a RemoteApp configured, so the connection is transparent to the user.
We connect to this different network location through a VPN tunnel (in this VPN tunnel, we already have a compression configured). So the Microsoft RDP do not compress the connection, I have configured the server with the recommended settings. When I open
just one instance of the software, it works perfectly. The problem happens when I open more than one instance of the software or let's say a software Help (F1). Two screens show as opened and when I try to navigate from one to another, it gives me the error.
Below you can find an image that illustrates what I am calling two instances of a software. I have created a simple WordPad Remote Application to check whenever the problem was directly involved with my ERP RemoteApp or any of them. With the WordPad application,
the problem also occurs.
http://social.technet.microsoft.com/Forums/getfile/502716
I have tried several different configurations (but the ones that should work are listed below) and also tried to check the
Event Viewer. Unfortunately, none work.
The following steps were used to disable encryption on Windows virtual desktops
Registry keys:
• Set HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\MinEncryptionLevel to 1.
• Create HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\SecurityLayer as a DWORD
value and set it to 0.
Disabling Compression and changing Authentication Level:
Step 1. Open the RDP connection (.rdp) file in Notepad.
Step 2. Change the line compression:i:1 to compression:i:0.
Step 2. Create a new line with authentication
level:i:0.
Step 3. Save the file.
Thank you,
Pedro Pagliosa

Hi,
The link you provided show: Page Not Found, please check it firstly.
For your problem, here is a hotfix that maybe helpful with it, please refer to the link below to download it for test.
http://support.microsoft.com/kb/2273487
If problem persists, please check Event Log and it should identify this problem, If so, please provide the detailed error message to us.
Roger Lu
TechNet Community Support

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