@zamboni, it seem that there a misunderstood somewhere.
The situation is the below:
There a Nethserver instance with the AD service running on it.
There's windows stations that connect without problems.
@Paulo_Rodrigues want a Mac join the AD service.
On a NethServer Instance, the AD service work like a PDC, a NT Domain.
A Mac can connect to a NT domain without lot of problem.
Why @stefano, did you affirm that a Mac can't?