Vista and Windows 7's  security policies are to only use NTLMv2 authentication.
Samba doesnt.Youll need to downgrade the auth policy as described in the following links:

http://www.builderau.com.au/blogs/codemonkeybusiness/viewblogpost.htm?p=339270746
http://technet.microsoft.com/en-us/library/dd566199(WS.10).aspx
http://developers.de/blogs/damir_dobric/archive/2009/08/16/enabling-of-ntlm-on-windows-7-and-windows-server-2008-r2.aspx

On Thu, Jan 27, 2011 at 10:23 AM, Jacob Odada <jacob.odada@gmail.com> wrote:
Has anyone been able to successfully authenticate windows 7 box against a Samba PDC ?

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Regards
Yonny Mutai