Registry Key to enable NTLM authentication on 2008 DC

I want to decrease a regkey in the security on a 2008 Domain Controller but I do now know where to find it? Is there anyone who can help me out? Thanks.

I think that this is controlled by Network security:LAN Manager authentication level and Default Domain Controller GPO setting, check the article below for more information:

http://technet.microsoft.com/en-us/l.../cc738867.aspx