Unable to connect to winnt

[S.Manikandan]

Hi all,

        Iam running a samba 2.0.3 on solaris 2.6 .I tried to connect to
windows NT m/c s with smbclient using NT domain user ids,like this

smbclient -L  WINNTHOST -U  WINDOWSDOMAIN\USERNAME

it says access denied .

smb.conf  is

[global]
encryted passwords = Yes
workgroup = Mydom
security = user

windows NT m/cs have  SP4 .when i try to connect to a windows 95 ,it
works fine.Iam able to access shares in w95 m/cs fine.

Any help will be appreciated,

TIA,

Mani.