Strange Error - "Object moved to here."

Question

I get the strange error "Object moved to here." on a blank white page when I try to login on a site I created. It works fine locally but not when I deploy it to the test or production server. I am not doing anything odd, just using basic authentication code in a helper function as follows...

public static bool AuthenticateUser(string Username, string Password, bool PersistLogin, string RedirectionURL)
    {
        if (Membership.ValidateUser(Username, Password))
        {
            FormsAuthentication.SetAuthCookie(Username, PersistLogin);                
            HttpContext.Current.Response.Redirect(RedirectionURL,true);
            return true;
        }
        else
            return false;
    }

Answer 1

A quick Google search revealed this KB article with a fix.

Answer 2

I think it is because page redirect to other page before return true. So "Object moved to here".

Answer 3

You need to use RedirectFromLoginPage in this context... for exactly this reason.

If you end response processing immediately, the auth cookie may not get set.