<authentication mode="Forms">
<forms name="AuthenticationCookie" loginUrl="Login.aspx"
protection="All" timeout="60" path="/">
<credentials passwordFormat="Clear">
<user name="yo" password="123"/>
</credentials>
</forms>
</authentication>
y en mi web Form Login
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Page.IsPostBack) Then
Session("login") = "false"
End If
End Sub
Protected Sub LoginButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
If (FormsAuthentication.Authenticate(Login1.UserName, Login1.Password)) Then
Session("login") = "true"
Login1.FailureText = "usuario aceptado"
Response.Redirect("Default.aspx")
Else
Login1.FailureText = "Error al Iniciar Sesion"
End sub
me autentifica la clave y el usuario,

si me pueden ayudar se los agradecere
