RDS invalid licensing Windows Server 2003 Client

Question

I have two Windows Server 2012 Session Host Server and two Windows 2012 Connection Brokers. One Connection Broker configured with remote desktop License.We are Using License type is per device cal.
On Server A, I can access RDP from Windows 7 clients and from Windows XP clients Windows Server 2003 Clients.
On Server B I can only RDP from Windows 7 clients and Windows XP Clients NOT from Windows Server 2003 Clients). The error is"The remote session was disconnected because the remote computer received an invalid licensing message from this computer"

Answer 1

Hi Gyan,
Which version of client RDP you are using in your environment?
Did you receive any particular Event ID during this issue?
Here for your issue I found something to let u know, if licensing mode on the terminal server is set to Per Device but the license server is configured to issue only Per User CALs, then only temporary Per Device licenses are issued from the available pool of
licenses. The license cannot upgraded. 
Please check the license is properly configured and activated. If not then you can contact MS clearing house or try to change the terminal server licensing mode.
Please refer below link for more information.
The remote session was disconnected because the local computer's client access license could not be upgraded or renewed
http://technet.microsoft.com/en-us/library/cc737592(v=ws.10).aspx
You need to verify the terminal server because it can’t able to locate the license server.
The terminal server cannot locate the license server
http://technet.microsoft.com/en-us/library/cc758805(v=ws.10).aspx
Hope it helps!
Regards.