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14.4.5. Server Security Mode (User-Level Security)
Server security mode was previously used when Samba was not capable of acting as a domain member server.
It is highly recommended to not use this mode since there are numerous security drawbacks.
smb.conf, the following directives enable Samba to operate in server security mode:
[GLOBAL] ... encrypt passwords = Yes security = server password server = "NetBIOS_of_Domain_Controller" ...