This is a weird one.
I just have installed fresh Windows 2008 R2 - just stand alone server. Updated with windows updates etc. , but nothing else loaded.
My intent was to use it as HOST server for Hyper-V.
I have installed Hyper -V role on it - everything was great - no problems.
At this point I realized that the Windows 2008 R2 Standard edition will allow only for 4 CPU for the Guest OS - based on the impression that Enterprise version will allow me for more more cores to be assigned to Guest OS I have decided to upgrade to Enterprise. (Note: Enterprise version will not allow for more cores than the Standard version - I know that now :))
Instead of reloading I used the procedure that allows to change the Product Key in order to upgrade from Standard to Enterprise.
This is when I noticed that I can not connect to the server using RDP anymore.
At first I tried to troubleshoot this the regular way - when eventually I noticed that the Remote Settings are gone all together from the server.
See below the screenshot of Remote Settings Tab in System Properties.
The Remote Desktop service is started - when I try to stop it I get:
There is nothing in the LOGS !!!
Thinking that the Virtual Networks from the Hyper-V may have something to do with this I have removed the role - so now I have "plain" Windows Server 2008 R2 Enterprise - without ability to remotely connect to it.
I would like to avoid re installing it from scratch - although it seems to be the fastest route at this point.