Windows XP SP3 – Enabling Remote Desktop With Network Level Authentication


In a previous post I set up Windows Vista SP1 to enable concurrent Remote Desktop sessions. This means that mutiple users can be logged in to my Vista machine via remote desktop at the same time.

What I did not mention was that had also I enabled Network Level Authentication (NLA) for extra security.

The problem is that Windows XP SP3 does not support NLA out-of-the-box. Some tweaking in the registry is required to enable it (from the Microsoft KnowledgeBase article):

  • 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.

So all-in-all a pretty quick fix that helps maintain the security of my Vista computer!

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4 thoughts on “Windows XP SP3 – Enabling Remote Desktop With Network Level Authentication

  1. Pingback: Vista SP1 – Enable Concurrent Remote Desktop Sessions | PricklyTech

  2. Pingback: Enabling Multiple Remote Desktop Sessions In Windows XP Professional | PricklyTech

  3. Renato Saraiva

    After these reconf I have now the message: autentication error code: 0×507. I’ve lost some part of the rules to fix the issue??

    Reply
    1. Mike Post author

      Hi Renato, from the error message it appears that you have not correctly enabled NLA on your XP machine.

      Reply

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