I've got ECTS implemented as the Extranet site on an existing test SharePoint site. I created a user, got the form for authentication, entered my validation information and it proceeded to presenting me with a login screen. I clicked cancel and it proceeded to take me to the web site. I've set up security for the Default and internet sites as Windows, NTLM, anonymous is not enabled, and Extranet is configued according to the ECTS manual. The login screen goes away if I click CANCEL on the first click, but I have to click OK 3 times before before it goes away.