[Samba] Samba Domain server authentication

[Rob Thoman]

Hi,

We're having issues accessing shares from our Samba file server.

If we try to access the share from a domain joined Windows machine, it
prompts with enter username and password. If we supply the domain password
it fails. The error that we get is the following.
Failed to find a Unix account for peteruser 'lin\aadamson' (from session
setup) not permitted to access this share (data)
create_connection_session_info failed: NT_STATUS_ACCESS_DENIED

However, if we  supply the pdcname\username and password it works, as per
below
[2018/03/29 20:04:07.754925,  5] auth/auth_util.c:111(make_user_info_map)
Mapping user [lin-pdc]\[aaamson] from workstation [PC-WIN-001-AR]

The server is joined to the Domain

net rpc join -U tadmin
Enter tadmin's password:
Joined domain LIN.

Here is
/etc/nssswith.conf

#passwd:         compat
#group:          compat
#shadow:         compat

passwd: files winbind
group:  files winbind
shadow: files winbind

smb.conf

        workgroup = LIN
        netbios name = LINFS01
        security = domain
        obey pam restrictions = no
       idmap config * : backend = tdb
       idmap config * : range = 3000-7999

winbind use default domain = yes
winbind enum users = yes
winbind enum groups = yes
wins server = 192.168.100.23

        password server = lin-pdc

 [homes]
        comment = our home
        create mask = 0700
        directory mask = 0700
        browseable = No
        read only = No
        path = %H/samba

other shares are also defined.

What could be the issue?

Regards,
RT