Samba 3.6 failed to authenticate Windows 2012 DC

I have a SUSE Linux Enterprise Server v11.2 SP2 x64.
Samba 3.6 server was not able to authenticate to my Windows 2012 domain controller.
This way I can access share resource on the W2K12 DC.
Is this a compatibility between Samba 3.6 & W2K12 DC?
Is there a workaround or solution?

dinhw,

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