asp.net(autehntification)

authentification (sql server 200)
voila le code:
 Dim cn As String = "server=localhost;uid=sa;pwd=;database=Lom"
        Dim user As String = TextBox1.Text
        Dim pass As String = TextBox2.Text
        Dim strhash As String = FormsAuthentication.HashPasswordForStoringInConfigFile(pass, "SHA1")
        Dim bn As Boolean = False
        Dim strsql As String = "select motdepasse from users where nom='" & user & "' and motdepasse='" & pass & "'"
        Dim cnn As SqlConnection = New SqlConnection(cn)
        Dim cmm As SqlCommand = New SqlCommand(strsql, cnn)
        cnn.Open()
        Dim dr As SqlDataReader
        dr = cmm.ExecuteReader()
        If (dr.Read()) Then
            bn = True

        End If
        dr.Close()
        cnn.Close()
        If bn Then
            FormsAuthentication.RedirectFromLoginPage(TextBox1.Text, False)
        Else
            MsgBox("wa login 9a3 mardame ach hadchi ")

        End If
2.et voila el message d'erreur :
Échec de la connexion de l'utilisateur 'sa'. Raison : Non associé à une connexion sécurisée SQL Server.
aide mois svp

Bonjour,

essais plutot ceci comme chaine de connection :
Data Source= localhost;Initial Catalog= Lom;User Id=sa;Password=myPassword;