To use the default Gina (msgina.dll) for Terminal Server clients:
1. Use the Registry Editor to navigate to:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal ServerWinStationsRDP-Tcp
2. Edit or Add Value name fUseDefaultGina, a REG_DWORD data type, and set the data value to 1 (0x1).