Support for Network Level Authentication on Windows XP SP3
The newer RDP clients support "NLA" Network Level Authentication.
Under XP SP3 "credssp" has to be enabled. KB951608
- Click Start, click Run, type regedit, and then press ENTER.
- In the navigation pane, locate and then click the following
registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
- In the details pane, right-click Security Packages, and then click Modify.
- In the Value data box, type tspkg. Leave any data that is specific to other SSPs, and then click OK.
- In the navigation pane, locate and then click the following
registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders
- In the details pane, right-click SecurityProviders, and then click Modify.
- In the Value data box, type credssp.dll. Leave any data that is specific to other SSPs, and then click OK.
- Exit Registry Editor.
- Restart the computer.