Usually if you connect to a Remote Desktop Session Host running on a Windows Server 2008 R2 you will be prompted for your credentials and if they are valid you will be logged in to your session directly.
On one of our servers everyone who logs on with RDP sees the usual Windows Logon Screen (green/blue background with username/password) after already entering them in the Remote Desktop Client. So, users are not directly logged in, but have to enter their credentials twice. It is only the case for this server. The server also is a Remote Desktop Connection Broker.
Is this behavior caused by a wrong setting or do you know how to get rid of it?