We notice that it failed to RDP (Remote Desktop) to Windows 2016 Server after Hardening done in my previous post
The error message above is due to
Deny access to this computer from the network
Guests, NT AUTHORITY\Local account and member of Administrators group
Deny log on through Remote Desktop Services
Guests, NT AUTHORITY\Local account
Please remove the NT AUTHORITY\Local Account & Local account and member of Administrators group to allow Administrator to login via RDP