[Samba] Help: session setup failed: NT_STATUS_LOGON_FAILURE

[=?big5?B?s6+n06n3?=]

Why I always get the following message when checking by smbclient?

root at bsdsr[/usr/local/etc/rc.d]#smbclient -L localhost -U%
added interface ip=192.168.1.254 bcast=192.168.1.255 nmask=255.255.255.0
session setup failed: NT_STATUS_LOGON_FAILURE

Something wrong with my settings?
TKS for your help!!

smb.conf as below
# Samba config file created using SWAT
# from 192.168.1.200 (192.168.1.200)
# Date: 2002/02/23 15:31:00

# Global parameters
[global]
	client code page = 950
	workgroup = MYHOME
	netbios name = BSDSR
	server string = Samba %v on thomas' FreeBSD
	interfaces = 192.168.1.254/24
	encrypt passwords = Yes
	update encrypted = Yes
	null passwords = Yes
	smb passwd file = /usr/local/samba/private/smbpasswd
	unix password sync = Yes
	log file = /var/log/log.%m
	max log size = 50
	os level = 65
	preferred master = True
	domain master = True
	valid chars = 0xb9
	guest account = guest
	hosts allow = 192.168.1. 127.

[homes]
	comment = Home Directories
	read only = No
	create mask = 0700
	directory mask = 0700
	browseable = No
	locking = No
	oplocks = No

[netlogon]
	comment = Network Logon Service
	path = /usr/local/samba/netlogon
	share modes = No

[lj5l]
	comment = HP LaserJet 5L on FreeBSD
	path = /var/spool/samba
	read only = No
	printable = Yes
	printer name = HP LaserJet 5L
	browseable = No
	oplocks = No