1/ Goto: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp
2/ Create DWORD
3/ Name: LogonTimeout (DWORD)
4/ Value: Specifies the time in seconds – Decimal Value – 300. Hex – (12c)its 5 minutes. – 3600. Hex (e10) is 1hr
5/ Please reboot the server after adding the above key.