ISAPI Filter on IIS7.0

Hi,

We have created ISAPI filter for Authentication purpose by capturing SF_NOTIFY_AUTHENTICATION notification.

It has been working fine on IIS5 & IIS6 and this event has been fired by IIS while request processing.

Now we are mirgrating to IIS7 and tyring to configure the same filter. Filter has been setup correctly and it has been loaded successfully.

We are also getting notification for SF_NOTIFY_PREPROC_HEADERS event. But somehomw we are not getting

notification for SF_NOTIFY_AUTHENTICATION event on IIS7 & higher. This is the case for anonymous authentication.

If we set basic authentication in IIS7 then filter starts working correctly i.e. SF_NOTIFY_AUTHENTICATION event occurs as expected.

Can someone help us here? Am I missing anyting?

Thanks in advance.