I was just wondering if you have applied the patch for the ASP.Net vulnerability which was released at http://weblogs.asp.net/scottgu/archive/2010/09/28/asp-net-security-update-now-available.aspx today.
To the best of my knowledge the patches for this security issue has not yet been installed on the server, however you should be able to enable your custom error on your application and this will help protect your websites from being exploited.
We are testing the new patch in our test environment. We will apply the patch once we fully tested the installation.