Here is the exception details...

Server Error in '/' Application.

---

Server Out Of Memory

There is no memory on the server to run your program. Please contact your administrator with this problem.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.OutOfMemoryException: Server Out Of Memory

There is no memory on the server to run your program. Please contact your administrator with this problem.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Here is a sample of an HTTP module that can be set up with forms based authentication (FBA) so that it logs you in as a visitor account by default. This enables you to control the visitor account just like a normal user account (since it is authenticated), and is transparent to the Sharepoint server.

This code has not been extensively tested, so don't deploy straight to your production environment, test it out thoroughly first. Be sure to set up an account called "Visitor" (It's hard coded that in the sample).
//=================================
using System;
using System.Security;
using System.Security.Principal;
using System.Web;
using System.Web.Security;
 
 
namespace HTTPAnonAuth
{
    class AnonModule : IHttpModule
    {
 
        public void Init(HttpApplication app)
        {
           
            app.AuthenticateRequest +=
                (new EventHandler(this.Application_AuthenticateRequest));
            app.PreSendRequestHeaders +=
                (new EventHandler(this.Application_PreSendRequestHeaders));
           
        }
 
        private void Application_AuthenticateRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            if (app.User == null)
            {
                string[] roles = new string[1];
                roles[0] = "GuestUser";
                GenericIdentity id = new GenericIdentity("Visitor","Forms");
                GenericPrincipal p = new GenericPrincipal(id, roles);
 
                app.Context.User = p;
            }
 
 
        }
 
        private void Application_PreSendRequestHeaders(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            if (app.Response.RedirectLocation != null)
            {
                if (app.Response.RedirectLocation.Contains("AccessDenied.aspx?Source")
                        && app.User.Identity.Name == "Visitor")
                {
                    app.Response.Redirect("/_layouts/login.aspx?ReturnUrl=" + app.Request.RawUrl);
                }
            }
 
 
        }
 
        public void Dispose()
        {
        }
    }
}
//=================================