Article ID: 2513796
Consider the following scenario:
• You have a Windows Server 2008-based computer that has the Terminal Service server role installed or Windows Server 2008 R2-based computer that has the Remote Desktop Service role installed,
In this scenario, you get “Access is Denied” error.
The issue occurs because multiple sessions using the same user’s credentials are not allowed when “Restrict each user to a single session” is enabled.
To fix the issue, disable the “Restrict each user to a single session” on the server.
The “Restrict Terminal Services users to a single remote session” Group Policy setting can be set in the “Computer Configuration\Administrative Templates\Windows Components\Terminal Services\Terminal Server\Connections” on Windows Server 2008
“Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Connections” on Windows Server 2008 R2 in the Local Group Policy Editor.
Changes to remote administration in Windows Server 2008
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.