I just purchased a Dell Windows 2016 server. In trying to tighten down the hatches and bullet-proof the server I did the following:
1) Create a new account with Administrator privileges
2) Rename the original Administrator account to Administrator(off)
3) Create a 3rd, new dummy account and call it "Administrator" and then disabled that account
I did all of this via Remote Terminal Services using the new account created in #1 above.
Everything was fine. But here's went things went awry.
I decided to change the port number from 3389 to 53389 using a REG file that I had export from a Windows 2003 server after performing the same port numbering switch. I suspect that is where my mistake came about. I should have opened the Registry Editor and manually changed the "PortNumber"=dword:0000d08d, but instead, I imported the entire [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp] key to this new 2016 server. I then rebooted the server.
Problem is, it is impossible to access the new server via Remote Terminal Services. And yes, I did try logging in with the new port number appended to the server's IP:
Sadly, there is no response. I tried 192.168.1.2, and 192.168.1.2:3389 just in case the REG import failed, but everything fails.
When I go to the physical server and try to log in using a keyboard, I cannot change the user. The server doesn't offer me the option to log in using the new account I created in #1 above. It's stuck with "Administrator", which of course, I had disabled.
Any suggestions on how to recover from this mess?