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Thread: XP LMCompatibilityLevel - Setting?

  1. #1
    Junior Member
    Join Date
    Jul 2003

    Question XP LMCompatibilityLevel - Setting?

    Hi again everyone...

    I was wondering if you guys wouldn't mind suggesting which LMCompatibilityLevel registry setting is best for me? I'm using XP Home 5.1.2600, dial-up internet, and I am not connected to a network.

    It's found in:

    Key: System\CurrentControlSet\Control\LSA
    Value: LMCompatibilityLevel
    Value Type: REG_DWORD - Number
    Valid Range: 0-5
    Default: 0

    And the possible settings are:

    0 - Send LM response and NTLM response; never use NTLMv2 session security
    1 - Use NTLMv2 session security if negotiated
    2 - Send NTLM authentication only
    3 - Send NTLMv2 authentication only
    4 - DC refuses LM authentication
    5 - DC refuses LM and NTLM authentication (accepts only NTLMv2)

    I'm thinking maybe setting #3 is the best? Since it's more "secure"? Or should I just leave the setting at the default value of 0?

    Thanks again!

  2. #2
    Yes, that's my CC number! 576869746568617's Avatar
    Join Date
    Dec 2003
    NTLMv2 is best. I don't know what good it would do for you, however, as it really only makes a difference it you have a network and your computer authenticates to a Windows NT/2000/2003 Domain. As XP Home cannot be used in a Domain, changing the setting won't do much for you.

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