Samba Member Server Troubleshooting
From SambaWiki
SeDiskOperator privilege can't be set
You want to set SeDiskOperatorPrivilege on your member server to manage your share permissions but you get an error like this:
# net rpc rights grant 'SAMDOM\Domain Admins' SeDiskOperatorPrivilege -U'SAMDOM\administrator' Enter SAMDOM\administrator's password: Could not connect to server 127.0.0.1 The username or password was not correct. Connection failed: NT_STATUS_LOGON_FAILURE
In this case you need to create a user mapping file (i.e. /etc/samba/user.map) with the following content:
!root = SAMDOM\Administrator SAMDOM\administrator Administrator administrator
After this you need to add a parameter to the [global] section of your smb.conf:
username map = /etc/samba/user.map
Restart or reload samba and you will then be able to set SeDiskOperatorPrivilege with the administrator account.