samba - Oct 2015 - upgrade Samba3 to Samb4 NT4 DC and got no currently logon servers

Hi,

Hope can someone give insights or what to do next, regarding with issue
encountered regarding with the upgrade of Samba3 to Samba4  NT4-style
domain with OpenLDAP backend.

It seems the upgrade went well as I could join the domain on the Windows 7
workstations, except adding still the registry mentioned on the link:
https://wiki.samba.org/index.php/Required_settings_for_NT4-style_domains

and issuing the command
> net sam rights grant ulipon SeMachineAccountPrivilege       (where ulipon
> is a user for joining the domain)
As it generate error like "The join operation was not successful.This could
be because an existing computer account having name "timawa-PC" was
previously created using a different set of credentials. Use a different
computer name or contact your system administrator to remove any stale
conflicting account. The error was: Access denied."

But when I restarted the workstation, it keeps displaying *"There are no
currently logon servers available to service the logon request.*" once
login as a domain. This is my query how to overcome this issue.

If I put the  (as we are planning it to upgrade our Windows 7 to Windows
10) in the smb.conf
> max protocol = NT1
"The trust relationship between this workstation and the primary domain
failed."


The logs I got related to printers, it seems no other error:

2015/10/14 16:26:38,  0]
../source3/smbd/server.c:1189(main)
>   smbd version 4.1.12 started.
>   Copyright Andrew Tridgell and the Samba Team 1992-2013
> [2015/10/14 16:26:38.641701,  0, pid=3337, effective(0, 0), real(0, 0)]
> ../source3/smbd/server.c:1269(main)
>   standard input is not a socket, assuming -D option
> [2015/10/14 16:26:49.539468,  0, pid=3338, effective(0, 0), real(0, 0)]
> ../lib/util/become_daemon.c:136(daemon_ready)
>   STATUS=daemon 'smbd' finished starting up and ready to serve
> connectionsFailed to fetch record!
>   STATUS=daemon 'smbd' finished starting up and ready to serve
> connectionsUnable to connect to CUPS server localhost:631 - Transport
> endpoint is not connected
>   STATUS=daemon 'smbd' finished starting up and ready to serve
> connectionsfailed to retrieve printer list: NT_STATUS_UNSUCCESSFUL
> [2015/10/14 16:27:49.610194,  0, pid=3364, effective(0, 0), real(0, 0)]
> ../source3/printing/print_cups.c:151(cups_connect)
>   Unable to connect to CUPS server localhost:631 - Transport endpoint is
> not connected
> [2015/10/14 16:27:49.610979,  0, pid=3339, effective(0, 0), real(0, 0)]
> ../source3/printing/print_cups.c:528(cups_async_callback)
>   failed to retrieve printer list: NT_STATUS_UNSUCCESSFUL
> [2015/10/14 16:40:50.371719,  0, pid=3487, effective(0, 0), real(0, 0)]
> ../source3/printing/print_cups.c:151(cups_connect)
>   Unable to connect to CUPS server localhost:631 - Transport endpoint is
> not connected
> [2015/10/14 16:40:50.372301,  0, pid=3339, effective(0, 0), real(0, 0)]
> ../source3/printing/print_cups.c:528(cups_async_callback)
>   failed to retrieve printer list: NT_STATUS_UNSUCCESSFUL
> [2015/10/14 16:46:32.046063,  0, pid=3339, effective(0, 0), real(0, 0)]
> ../lib/util/pidfile.c:153(pidfile_unlink)
>   Failed to delete pidfile /run/smbd.pid. Error was No such file or
> directory
> [2015/10/14 16:46:32,  0] ../source3/smbd/server.c:1189(main)
>   smbd version 4.1.12 started.
>   Copyright Andrew Tridgell and the Samba Team 1992-2013
> [2015/10/14 16:46:32.092789,  0, pid=3594, effective(0, 0), real(0, 0)]
> ../source3/smbd/server.c:1269(main)
>   standard input is not a socket, assuming -D option
> [2015/10/14 16:46:43.108807,  0, pid=3595, effective(0, 0), real(0, 0)]
> ../lib/util/become_daemon.c:136(daemon_ready)
>   STATUS=daemon 'smbd' finished starting up and ready to serve
> connectionsFailed to fetch record!
>   STATUS=daemon 'smbd' finished starting up and ready to serve
> connectionsUnable to connect to CUPS server localhost:631 - Transport
> endpoint is not connected
>   STATUS=daemon 'smbd' finished starting up and ready to serve
> connectionsfailed to retrieve printer list: NT_STATUS_UNSUCCESSFUL
> [2015/10/14 16:47:43.177001,  0, pid=3616, effective(0, 0), real(0, 0)]
> ../source3/printing/print_cups.c:151(cups_connect)
>   Unable to connect to CUPS server localhost:631 - Transport endpoint is
> not connected
> [2015/10/14 16:47:43.177547,  0, pid=3596, effective(0, 0), real(0, 0)]
> ../source3/printing/print_cups.c:528(cups_async_callback)
>   failed to retrieve printer list: NT_STATUS_UNSUCCESSFUL

It will display all the users/groups using getent / id <user> via cli.
> getent group
> getent passwd

By the way I am using:
CentOS Linux release 7.1.1503 (Core)
samba-4.1.12-23.el7_1.x86_64
openldap-2.4.39-7.el7.centos.x86_64

smb.conf
[global]
workgroup = LUMAD
netbios name = samba-ldapsam

deadtime = 10

log level = 1
log file = /var/log/samba/log.%m
max log size = 5000
debug pid = yes
debug uid = yes
syslog = 0
utmp = yes

security = user
domain logons = yes

os level = 64
logon path logon home logon drive logon script 
passdb backend = ldapsam:"ldap://lumad.sandbox.local/"
ldap ssl = no
ldap admin dn = cn=admin,dc=lumad,dc=sandbox,dc=local
ldap delete dn = no

## Sync UNIX password with Samba password
## Method 1:
ldap password sync = yes
## Method 2:
;ldap password sync = no
;unix password sync = yes
;passwd program = /usr/sbin/smbldap-passwd -u '%u'
;passwd chat = "Changing *\nNew password*" %n\n "*Retype new
password*"
%n\n"

ldap suffix = dc=lumad,dc=sandbox,dc=local
ldap user suffix = ou=users
ldap group suffix = ou=groups
ldap machine suffix = ou=computers
ldap idmap suffix = ou=idmap

add user script = /usr/sbin/smbldap-useradd -m '%u' -t 1
rename user script = /usr/sbin/smbldap-usermod -r '%unew'
'%uold'
delete user script = /usr/sbin/smbldap-userdel '%u'
set primary group script = /usr/sbin/smbldap-usermod -g '%g'
'%u'
add group script = /usr/sbin/smbldap-groupadd -p '%g'
delete group script = /usr/sbin/smbldap-groupdel '%g'
add user to group script = /usr/sbin/smbldap-groupmod -m '%u'
'%g'
delete user from group script = /usr/sbin/smbldap-groupmod -x '%u'
'%g'
add machine script = /usr/sbin/smbldap-useradd -w '%u' -t 1


Dos charset = CP932
Unix charset = UTF-8


[homes]
  comment = Home Directories
  browseable = yes
  writable = yes
#[printers]
#  comment = All Printers
#  path = /var/spool/samba
#  printable = Yes
#  print ok = Yes
#  browseable = No
[netlogon]
  comment = Network Logon Service
  path = /var/lib/samba/netlogon
  browseable = No
  writable = No
[Profiles]
  path = /var/lib/samba/profiles
  create mask = 0755
  directory mask = 0755
  writable = Yes

[sambashare]
    writeable = yes
    browseable = yes
    path = /sambashare


Thanks,
Mario