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August 25, 2009

Remote Desktop Connection with Network Level Authentication in XP

It was my understanding that the Remote Desktop Protocol in Windows XP was never going to support Network Level Authentication. Well low and behold, with XP Service Pack 3 you can use the CredSSP Security Service Provider to enable it. The only problem is that in Windows XP, CredSSP is turned off by default.

Turn on CredSSP

  1. Within the Registry Editor, navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa subkey.
  2. Modify the Security Packages value by adding tspkg to the list of packages.
  3. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders.
  4. Modify the SecurityProviders value by adding credssp.dll to the list of providers.
  5. Restart your computer.

RDP NLA Supported

Sources: Microsoft KB article 951608: Description of the Credential Security Service Provider (CredSSP) in Windows XP Service Pack 3

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