Outlook Anywhere and ActiveSync monitors showing down

Aaron - is there documentation on how to build an HTTP/S monitor supporting NTLM for Outlook Anywhere? I'm having the exact symptoms in this thread using the latest iApp on 11.2. I've tried making my own HTTP/S monitor as you suggest, but it has the same problem. I can log into the CAS servers directly using OA with the monitoring account, or through the F5s to the CAS servers using the monitor account if the F5 is configured to use basic health monitors, but as soon as I set Advanced monitors OA breaks while the rest of the monitors are fine.