Aidan Finn, IT Pro

This isn’t exactly a Hyper-V issue (it’s RDS) but Hyper-V is running on the affected WS2012 hosts. 

Consider the following scenario:

• You deploy a Virtual Desktop Infrastructure (VDI) environment in a network.
• You enable the Remote Desktop Virtualization Host (RD Virtualization Host) role service on the Windows Server 2012-based computers.
• You try to log on to a virtual machine that is running Windows 8 or Windows Server 2012 in the VDI environment.

In this scenario, you cannot log on to the virtual machine. The logon screen appears but the logon process cannot be completed.
Notes

• The previous corresponding remote session to the RD Virtualization Host does not log off.
• You may receive the following error message when you try to manually logoff the session in the Server Manager console:

  RD Connection Broker failed to process the connection request for user <domain>\<userid>.
  Failed while checking for disconnected session.
  Error: User is trying to connect to the same Pool more than once simultaneously.

This issue occurs because the host computer does not receive a notification that the previous session has ended during the logoff operation. Therefore, the previous session does not log off successfully.

A supported hotfix is available from Microsoft.

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4. Evaluate Hyper-V, Windows Server 2012, and System Center 2012 For Free