How to Disable LM Authentication

LanMan (LM) Authentication is a form of encryption used by older Windows systems such as Windows 2000, NT, and XP to store passwords. The LM encryption scheme has been cracked, so administrators disable it to stop the transfer of LM passwords across the network, which is a security hole.

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Instructions

- 1
  
  Click the Windows "Start" button and select "Run". Type "regedit" in the text box and press "Enter" to open the Windows registry editor.
- 2
  
  Navigate to "HKEY_LOCAL_MACHINE\System\CurrentControlSet\control\LSA." In this key is the LM authentication setting.
- 3
  
  Right-click "LMCompatibilityLevel" and select "Modify". This opens a configuration window in which you can change the settings.
- 4
  
  Type "5" in the value text box and click "OK" to save your settings. Reboot your computer for the changes to take effect.

Windows Networking: How to Disable LM Authentication

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How to Disable LM Authentication

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