samba - Oct 1999 - The Account is not authorized to login from this station

Hi,

I have samba2.0.3 on solaris 2.6. On my NT side I have NT4 with SP3.
On Windows Explorer I am able to see my Samba server. when I click on that 
It is asking me for user name and passwd. whne I entered it is giving me the 
error message of " The Account is not authorized to login from this 
station". my smb.conf file contains:

[global}
	guest account = guest
	work group = MSWGRP
	dns proxy = no
[homes]
	comment = home directories
	path = /local/guest
	readonly = no
	public = yes
	username = USERNAME
	security = user
I will apreciate if any one gives me clue, to solve it.

Thanks in advance
-RV

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