I use Account provider: Samba Active Directory with Windows 7 and 10, everything works very well.
Sometimes I use a Linux Client, is it possible to connect to nethserver without install additional software ?
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YES! 
…but root cannot work! Only domain users can access samba shares.
More info
http://docs.nethserver.org/en/v7/shared_folder.html#network-access
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username: mydomain\admin
password: myadminpassword
Thank you …
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If you want your linux client to join the Samba4 domain, this might come in handy: http://www.lancaster.ac.uk/iss/tsg/unix-ad/
At Zentyal wiki there is also a clear howto: https://wiki.zentyal.org/wiki/Authenticating_Linux_client_against_Samba
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