"Access is denied" message after logging in to windows 2012 r2 via remote desktop

I installed the Remote Desktop Session Host server role on a windows 2012 r2 machine. After that, I rebooted the VM and now when I try to log in via remote desktop, after a little while in the log in process, I get an "Access is denied" yellow message with an OK button below. I was able to log in before that.

Any idea on how I can fix this? I am local admin on the server but I cannot launch remotely the Server Manager. I was able to run the Computer Management console.

Thanks

I know this is an old question, but it just got bumped up to the home page.

If you find yourself locked out of a Remote Desktop server, just run mstsc.exe /admin. This will log you in to the console session, bypassing all RDS licensing issues.