I have two identical machines running Windows 7, and I'm trying to replicate the security policy settings of one on the other (these are the settings under secpol.msc).
One machine has a setting Local Policies > Security Options > Network security: LAN Manager authentication level setting of Not Defined. The other has one of the options selected.
How do I reset that option to "Not Defined"? It doesn't appear in the list of options when I open its properties and there's no visible action to clear it.
Answer
Delete the regkey entry (DWORD) LmCompatibilityLevel under HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Control\Lsa and reboot.
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