How many rdp sessions windows server 2012 Support by default
By default windows server 2012 supports 2 concurrent sessions for Administration.
Multiple RDP connections windows server 2012
Follow below steps in sequence to have multiple Remote Desktop Connections on windows server 2012.
2.write gpedit.msc and open it
3.Go to computer configuration -> Administrative Templates -> Windows Components
->Remote Desktop services -> Remote Desktop Session Host -> Connections.
4. Here Disable the below mentioned.
Restrict Remote Desktop Services user to a single remote.
5.Now Run elevated CMD and type gpupdate and hit enter. It should successfully applied.