Change instance type - NLA problem; Settings to allow users to RDP into a server
Note that this should be done after joining a server to a domain and making sure that its DNS setting are correct. Use local admin account to do this.

- Search for sysdm.cpl and open it. This will open a window like the one on the left-most of the picture
- On the remote tab, check "Allow remote connections to this computer" and the option below it then click on "Select Users..." button
- On the new window, click on "Add..." button
- On the new window, type in "domain users" then click on "Check Names" button, this will format what you typed as shown in the picture
- Click on "OK" on all windows for the changes to take effect