samba - Sep 2004 - [HELP!!!]: Fail to mount with NULL password in samba 3.0.6

Can anybody answer me?! Thanks in advance!!!

I have patch 3.0.6 with all patchs in
http://samba.org/~jerry/patches/post-3.0.6/ ,
and set null passwords = yes in smb.conf. It works well to mount samba share in 
linux box when user alpha have non-empty password. 

But when set alpha's passwork as NULL, I get the follow messages:

# mount -t smbfs -o username=alpha,password="" //192.168.3.101/pub
/mnt
Anonymous login successful
24968: tree connect failed: ERRDOS - ERRnoaccess
SMB connection failed

And what samba log say:
 	[2004/08/24 16:30:08, 2] auth/auth.c:check_ntlm_password(312)
 	  check_ntlm_password:  Authentication for user [alpha] -> [alpha] FAILED
with error NT_STATUS_WRONG_PASSWORD
	

Best Regards!

Jacky Kim
.