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Active Directory(10) W2K8 R2 AD Tips: Watch the LAN Manager Authentication Level(10) W2K8 R2 AD Tips: Watch the LAN Manager Authentication Level
Again, when you have NT4 or Windows 2000 clients you have to pay attention to LAN Manager (LM) compatibility problems when you upgrade your domain controllers. The LM authentication or compatibility level determines which LAN Manager authentication protocols (LM, NTLM, or NTLMv2) the client will try to negotiate or that the server will accept.
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