check_ntlm_password:  Authentication for user [teacher] -> [teacher] FAILED with error NT_STATUS_NO_SUCH_USER
[2016/01/06 14:00:51.944975,  3] ../source3/auth/auth_util.c:1593(do_map_to_guest_server_info)
  No such user teacher [HeritageFileServer] - using guest account

---------------
Unix username:        tech
NT username:
Account Flags:        [U          ]
User SID:             S-1-5-21-3838925055-3536237277-778935331-1000
Forcing Primary Group to 'Domain Users' for tech
Primary Group SID:    S-1-5-21-3838925055-3536237277-778935331-513
Full Name:            Tech
Home Directory:       \heritagefileservertech
HomeDir Drive:
Logon Script:
Profile Path:         \heritagefileservertechprofile
Domain:               HERITAGEFILESERVER
Account desc:
Workstations:
Munged dial:
Logon time:           0
Logoff time:          never
Kickoff time:         never
Password last set:    Wed, 06 Jan 2016 13:07:05 MST
Password can change:  Wed, 06 Jan 2016 13:07:05 MST
Password must change: never
Last bad password   : 0
Bad password count  : 0
Logon hours         : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
---------------
Unix username:        teacher
NT username:
Account Flags:        [U          ]
User SID:             S-1-5-21-3838925055-3536237277-778935331-1001
Forcing Primary Group to 'Domain Users' for teacher
Primary Group SID:    S-1-5-21-3838925055-3536237277-778935331-513
Full Name:
Home Directory:       \heritagefileserverteacher
HomeDir Drive:
Logon Script:
Profile Path:         \heritagefileserverteacherprofile
Domain:               HERITAGEFILESERVER
Account desc:
Workstations:
Munged dial:
Logon time:           0
Logoff time:          never
Kickoff time:         never
Password last set:    Mon, 04 Jan 2016 15:22:14 MST
Password can change:  Mon, 04 Jan 2016 15:22:14 MST
Password must change: never
Last bad password   : 0
Bad password count  : 0
Logon hours         : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

#======================= Global Settings =======================

[global]

;workgroup = WORKGROUP

server string = %h server (Samba, Ubuntu)

dns proxy = no

#interfaces = eth0

log level = 3

log file = /var/log/samba/log.%m

max log size = 1000

syslog = 0


####### Authentication #######

;server role = standalone server

security = user

guest account = nobody

map to guest = bad user

;usershare allow guests = yes

#======================= Share Definitions =======================

 [printers]
comment = All Printers
browseable = yes
path = /var/spool/samba
printable = yes
guest ok = yes
read only = yes
create mask = 0700

[print$]
comment = Printer Drivers
path = /var/lib/samba/printers
browseable = yes
read only = yes
guest ok = yes

[share]
comment= Heritage File Server
path = /media/external/ServerBackup
browsable = yes
guest ok = yes
read only = no
create mask = 0755

[Share]
comment= Heritage File Server
path = /media/external/ServerBackup
browsable = yes
guest ok = yes
read only = no
create mask = 0755

[Shared]
comment= Heritage File Server
path = /media/external/ServerBackup
available = yes
valid users = teacher
browsable = yes
guest ok = no
read only = no
writable = yes
create mask = 0755

[web]
comment = Heritage Web Hosting
path = /var/www/html
browsable = yes
guest ok = no
read only = no
create mask = 0755

[homes]
comment = Home Directories
browsable = yes
read only = yes

sudo smbpasswd -a < username>

sudo service smbd restart