To resolve this issue, open a command prompt as Administrator, and then type: REG ADD HKLM\SYSTEM\CurrentControlSet\serv ...

To resolve this issue, open a command prompt as Administrator, and then type:
  REG ADD HKLM\\SYSTEM\\CurrentControlSet\\services\\HTTP\\Parameters\\SslBindingInfo\\0.0.0.0:443  /v DefaultFlags /t REG_DWORD /d 1 /f
  net stop tsgateway
  net start tsgateway

  For more information, see "How to Manage the Remote Desktop Gateway Service in Windows Server Essentials" at http://go.microsoft.com/fwlink/p/?LinkId=298677.