Resolve "session setup failed: ERRDOS - ERRnoaccess (Access denied.)"

In samba, if get:

session setup failed: ERRDOS - ERRnoaccess (Access denied.)

while trying mount -a after editing fstab, e.g.:

//server/dir /home/dir smb username=administrator,password=123 0 0

then

add domain, e.g.:

//server/dir /home/dir smb username=administrator/domain_name,password=123 0 0