Remote session was disconnected because there are no remote desktop licence servers available to provide a licence. Please contact the server administrator

Hi,
I am getting this error from windows server : remote session was disconnected because there are no remote desktop licence servers available to provide a licence. Please contact the server administrator.
Remote desktop Session Host Server Configuration Details:
The RD licensing Diagnoser(WIN-909xxxxxxxxxxx):
Number of license available for clients : 0
Remote Desktop Session Host server version: Windows server 2012 R2
Active Directory Domain : Not applicable
Licensing mode  : Not configured
Now, Down I am getting this error as well shown by the system:
RD licensing Diagnoser Information- 2 errors:
 Win-909xxxxxxxxxx : licensing mode for the Remode Desktop Session Host Server is not configured.
 Win-909xxxxxxxxxx : The grace period for the Remote Desktop Session Host server has Expired, but the RD Session Host server has not been configured with any license servers. connections to the RD Session Host server will be denied
unless a license server is configured for the RD Session Host server.
Now my kestion is :
Do I need to buy a license key of the windows server to not getting this error or it may continue appear even if I purchased the license and not configure RDS and AD.
Do I need to configured only  RDS and AD and buy the license key of windows server later because I still have 55 day of trial.
Do I just buy the RDS client access license (L).
Please could you help on this, am new in windows server?

Hi,
As the message indicates, the grace period for the Remote Desktop Session Host server has Expired, you need to purchase and install RDS CALs. Also, you need to configure related settings
to continue using Remote Desktop Services. Otherwise, you cannot connect to the server remotely.
References:
Understand the licensing grace period
http://technet.microsoft.com/en-us/library/hh553157(v=ws.10).aspx
Install and issue RDS CALs or TS CALs
http://technet.microsoft.com/en-us/library/hh553159(v=ws.10).aspx
Remote Desktop Services Client Access Licenses (RDS CALs)
http://technet.microsoft.com/en-us/library/cc753650.aspx
Specify the Remote Desktop Licensing Mode on an RD Session Host Server
http://technet.microsoft.com/en-us/library/cc754487.aspx
Specify a License Server for an RD Session Host Server to Use
http://technet.microsoft.com/en-us/library/cc770585.aspx
Meanwhile,
1. AD is not required for RDS. However, it is recommended.
2. As you do not purchase Windows Server and related licenses as well, I suggest you contacting Microsoft sales or partner firstly.
How to buy Windows Server 2012 R2
http://www.microsoft.com/en-us/server-cloud/products/windows-server-2012-r2/buy.aspx
Best Regards.
Jeremy Wu
TechNet Community Support

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