[Samba] How to revalidate user?

[=?big5?q?aluba1231.tw?=]

 I changed the password for a samba user. I want the
change to effect immediately, so i restart samba. But
this cause the windows client fail to logon anymore, 
the reason is windows will cache old username/password
pairs and used it all the time unless I logout the
windows. If there is any way to force windows client
to re-enter the username and password?

-----------------------------------------------------------------
§Ûªñ¸ô¡I¡IEmail³B³B¦¬¡I
§K¶O¤U¸üYahoo!©_¼¯±¶®|¦C
http://tw.companion.yahoo.com/