Web site not allowing me to log in

The asp code is as follows:

<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" CodeFile="Login.aspx.vb"
      Inherits="Login_aspx" Title="Login" %>

<asp:Content ID="MainContent" ContentPlaceHolderID="Main" runat="server">
      <div id="body">
            <div id="col_main_left">
                  <div id="user_assistance">
                        <a id="content_start"></a>
                        <h3>
                              Help and Other Links</h3>
                <p>
                    Need your Bond and Rent paid to you today, visit</p>
                <p>
                    <a href="http://www.bondloans.com.au"><span style="color: #0000ff">www.bondloans.com.au</span></a></p>
                <p>
                    Low Interest</p>
                <p>
                    <b>Instant Phone approval</b></p>
                <p>
                    $ 500 to $ 5,000 Paid to you today</p>
                <p>
                    Pay out early, no penalties</p>
                <p>
                    No up front fees, Save $$$</p>
                <p>
                    Phone NOW <strong>1300 555 311</strong></p>
                  </div>
            </div>
            <div id="col_main_right">
                  <h2 class="section">
                        Login</h2>
                  <div class="content_right">
                        <asp:Panel ID="AccessNoticePanel" runat="server" EnableViewState="False" Visible="False">
                              <b>New to propetyforrent.com.au? If you want to login youll need to register first,
                        its fast and free.<br />
                        <br />
                        You have accessed a page or feature that requires login information.</b><br />
                              Use the form below to log in using your account information, or <b>
                                    <asp:HyperLink ID="ProtectedPageRegisterLink" runat="server" NavigateUrl="~/Register.aspx">click here to register</asp:HyperLink></b>.<br />
                              <br />
                        </asp:Panel>
                        <asp:Login ID="LoginConrol" runat="server" TitleText="" CssClass="login_box">
                              <TextBoxStyle CssClass="text"></TextBoxStyle>
                        </asp:Login>
                        <p>
                              <asp:HyperLink ID="RegisterLink" runat="server" NavigateUrl="~/Register.aspx">Create an Account</asp:HyperLink></p>
                        <p>
                              <asp:LinkButton ID="ForgotPasswordButton" runat="server" OnClick="ForgotPasswordButton_Click">Forgot Password?</asp:LinkButton>
                        </p>
                        <asp:PasswordRecovery ID="PasswordRecovery" runat="server" Visible="False" UserNameTitleText=""
                              QuestionTitleText="Step 2: Identity Confirmation." UserNameInstructionText="Step 1: Enter your User Name."
                              Width="280px">
                              <TitleTextStyle Font-Bold="True"></TitleTextStyle>
                              <InstructionTextStyle Font-Bold="True"></InstructionTextStyle>
                              <LabelStyle Wrap="False" />
                        </asp:PasswordRecovery>
                        <p>
                              &nbsp;</p>
                        <p>
                              &nbsp;</p>
                        <p>
                              &nbsp;</p>
                        <p>
                              &nbsp;</p>
                        <p>
                              &nbsp;</p>
                  </div>
            </div>
      </div>
</asp:Content>

The vb code is as follows:

Imports System
Imports System.Web.UI.WebControls

Imports AspNet.StarterKits.Classifieds.BusinessLogicLayer

Partial Class Login_aspx
      Inherits System.Web.UI.Page

      Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
            If (Not Page.IsPostBack) Then
                  AccessNoticePanel.Visible = Not (Request.QueryString("ReturnUrl") Is Nothing)
            Else
                  AccessNoticePanel.Visible = False
            End If
      End Sub

      Protected Sub ForgotPasswordButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ForgotPasswordButton.Click

            Me.PasswordRecovery.Visible = True

      End Sub

      Protected Sub PasswordRecovery_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles PasswordRecovery.Init
            Dim s As SiteSettings = SiteSettings.GetSharedSettings()
            PasswordRecovery.MailDefinition.From = s.SiteEmailFromField
      End Sub

      Protected Sub PasswordRecovery_SendMailError(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SendMailErrorEventArgs) Handles PasswordRecovery.SendMailError
            Dim mailLink As New System.Text.StringBuilder("<a href=""mailto:")
            Try
                  mailLink.Append(SiteSettings.GetSharedSettings().SiteEmailAddress)
            Catch
                  mailLink.Append("#")
            End Try
            mailLink.Append(""">system administrator</a>")
            PasswordRecovery.SuccessText = "A problem occurred sending the email. " & _
                  "Please contact the " & mailLink.ToString() & "."
            e.Handled = True

      End Sub


    Protected Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Unload
        Session("LoginUserName") = LoginConrol.UserName
    End Sub
End Class

I believe the code is fine, I think the problem might be in the authentication. Reason being that I noticed asp.net configuration didn't have a working link to the database. So I copied over another working version of the code and it gives the error :
" The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). "

I tried changing the web.config file (per the following) but that didn't help.
<system.web>
        <authorization>
            <allow roles="site_admin" />
            </authorization>
    </system.web>

you say it works in debug mode?
what's the set up that works?

Change that last post to read
    <authorization>
      <deny users="?" />
      <allow users="*" />
    </authorization>

It works in debug mode

The template code also works (all of the time), so I'm back to thinking it could be a coding error.

But I haven't changed the login.aspx code at all (the code posted above), so I know it's not that.

to check the code - make a change that you would see - then upload it - and run it - Its  just incase your code isn't being uploaded proper then see if your change is there.

When trying to add something to the working database I get the error " Failed to update database "C:\INETPUB\TEST\APP_DATA\CLASSIFIEDSDB.MDF"  because the database is read-only ". I think this might be a clue. How could it be read only ?.

I added IUSR_servername to the site folder in explorer, I've read other posts relating to this problem in XP, but I'm running 2003 server. Other posts say to add aspuser, but I think this is for IIS 5 because I can't find an aspuser.

I might start another question because I think this post is getting too long, I'll get back with a final answer.

I'm going to accept this as an answer because I want to research it more. I still get the same problem. Some of things I did to get further down the track was to delete all files and copy over a fresh set of files. The mdf file wouldn't delete so I restarted the server. It still won't let me log in.

the read only  maybe due to copyng it across - try changing the attibutes of the database (right click and click on properties)