NT_STATUS_LOGON_FAILURE.

I got the above mentioned error message when testing my samba configuration at the linux server
smbclient //linux/user
I don't get this error when I us
smbclient //linux/root

or when I use the following command I found somewhere on the internet

smbclient //linux/username -W USERS -U username

This syntax is not very helpfull when trying to connect with a windows client. What do I need to change in order to log on with the normal smbclient //linux/user syntax

I looked at the explanation under NT_STATUS_LOGON_FAILURE in experts exchange, but this didn't do the trick

attached my smb.conf
# smb.conf is the main Samba configuration file. You find a full commented
# version at /usr/share/doc/packages/samba/examples/smb.conf.SUSE if the
# samba-doc package is installed.
# Date: 2005-03-22
[global]
      workgroup = TUX-NET
      printing = cups
      printcap name = cups
      printcap cache time = 750
      cups options = raw
      printer admin = @ntadmin, root, administrator
      username map = /etc/samba/smbusers
      map to guest = Bad User
      include = /etc/samba/dhcp.conf
      logon path = \\%L\profiles\.msprofile
      logon home = \\%L\%U\.9xprofile
      logon drive = P:
      add machine script = /usr/sbin/useradd  -c Machine -d /var/lib/nobody -s /bin/false %m$
      domain logons = Yes
      domain master = Yes
      local master = Yes
      os level = 65
      preferred master = Yes

            
[public]
      path= /home
      comment = Public Folder
      public = yes
      only guest = yes
      force directory mode = 777
      delete read only = 777
      wide links = no
      force create mode =777
      directory mode = 777

[homes]
      comment = Home Directories
      users = %S
      browseable = No
      read only = No
      inherit acls = Yes

[profiles]
      comment = Network Profiles Service
      path = %H
      read only = No
      store dos attributes = Yes
      create mask = 0600
      directory mask = 0700

[users]
      comment = All users
      valid users = @users
      writeable = yes
      veto files = /aquota.user/groups/shares/
      path = /home
      inherit acls = Yes
      read only = No

[groups]
      comment = All groups
      path = /home/groups
      read only = No
      inherit acls = Yes

[printers]
      comment = All Printers
      path = /var/tmp
      printable = Yes
      create mask = 0600
      browseable = No

[print$]
      comment = Printer Drivers
      path = /var/lib/samba/drivers
      write list = @ntadmin root
      force group = ntadmin
      create mask = 0664
      directory mask = 0775

[netlogon]
      comment = Network Logon Service
      path = /var/lib/samba/netlogon
      write list = root