[Samba] Could not authenticate user user%password with plaintext password

[M Azer]

Hello,

I am new to samba however i am trying configure samba to attach to 2003 AD
as ADS which worked ok however i am getting this error message:
[root at linux user]# wbinfo -a user%password
plaintext password authentication failed
error code was NT_STATUS_ACCESS_DENIED (0xc0000022)
error messsage was: Access denied
Could not authenticate user user%password with plaintext password
challenge/response password authentication succeeded

I am able to run wbinfo -g and wbinfo -u and from windows xp client machine
i am able to browse the network and see the samba server but  its not
accessible. you might not have permission error.
my smb.conf is
[global]
        workgroup = CAD
        security = ADS
        realm = CAD.TESTDOMAIN
        client use spnego = no
        server signing = auto
        netbios name = linux
        winbind use default domain = yes
        winbind separator = +
       encrypt passwords = yes
        log level = 3
        log file = /var/log/samba/%m
        max log size = 50

        password server = VDC2.CAD.TESTDOMAIN
        template shell = /bin/bash
[test]
        comment = Test Share using Active Directory
        path = /data
        valid users = @"VDC2\Users"
        writeable = yes
        browseable = yes