Problems callig API's LogoUser

   Hi!

        I use the API LogonUser in my application in order to authenticate
users. It doesn't work, and I always get the message 'Client hasn't the
required privilege'. I tried to give the privileges of SE_TCB_NAME and
SE_CHANGE_NOTIFY_NAME to the process (as I read in Winapi's help) but the
result remains the same. Any idea??

        Thanx

                Nacho    

P.S.: Sorry for my poor english