How to enable Windows XP Network Level Authentication

In order to allow Windows XP to connect, using RDP, to Windows 7, without changing security level, we need to accomplish two steps:

     1.       Install Microsoft Remote Desktop Connection 7.0 client or later

URL: http://support.microsoft.com/kb/969084

      2.       Tweak some registry values

Follow these steps to make the required registry tweaks:

     1.       Open the registry editor, Start->Run->regedit

      2.       Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

      3.       Modify the value Security Packages

      4.       Add the value tspkg

      5.       Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders

      6.       Modify the value SecurityProviders

      7.       Add the value credssp.dll (don’t forget the comma before)

      8.       Exit registry editor

      9.       Restart the computer