I have a windows 2000 SP4 DC for domain RVOLTA. As a samba 4.3.1 member server named fileserver I joined the domain with net ads join with no problems. The machine account was created. Once in a while my event log on windows DC reports event ID 5722: Event Type: Error Event Source: NETLOGON Event Category: None Event ID: 5722 Date: 17-01-2016 Time: 19:12:05 User: N/A Computer: RVLXW2K Description: The session setup from the computer FILESERVER failed to authenticate. The name of the account referenced in the security database is FILESERVER$. The following error occurred: Access is denied. As far as I could go was that machine password account is incorrect in the DC and the samba domain member. I already reseted the machine password, deleted and rejoined the domain, added more SPN, etc, for no avail. I am left with no more ideas. Anyway, apart from that everything works ok. Thanks Pedro Guedes