samba 登陆密码问题

[jiangsu04]

我设置了几个Guest共享文件夹和一个特定用户文件夹
特定用户在第一次登陆时要求输入密码
但我还设置了 dead time 希望超出时间后 连接实效 重新输入密码
配置文件如下

[global]
workgroup = myWORKGROUP
server string = MD server
security = user
username map = /etc/samba/smbusers
#encrypt passwords = true
smb passwd file = /etc/samba/smbpasswd
dead time = 1

[share-3]
#comment = sir
path = /home/dm/test
browseable = yes

writeable = yes
#public = yes
#guest ok = yes
valid users = sir,test,dm, jadministrator

[share-1]
path = /home/dm/share
browseable = yes

writeable = yes
guest ok = yes
[share-2]
path = /home/dm/share2
browseable = yes

writeable = yes
guest ok = yes
[桌面共享]
path = /home/dm/桌面/Sharing
browseable = yes

writeable = yes
guest ok = yes

可是现在特定用户登录一次之后 即使超时 仍然照常访问， 没有要求重新输入密码

请问是什么地方有问题？
请各位指教， 谢谢！

[jiangsu04]

各位帮帮忙啊