We have just gotten 2.9 running on IIS (Windows Server 2012) with LDAP configured (AD), but Mac users coming from Safari, Chrome, and Opera are being prompted for a client certificate when they attempt to access the login page. In most cases, no matter what the user selects in the dialog box, access to the page is denied with a 403 - Forbidden error. The problem does not occur with Firefox, and it does not seem to occur on Windows (no one has reported it so far). To be clear, this not a problem with the login credentials themselves. The user isn't even allowed to access the login page because of the certificate issue.
Here's an example, from Safari:
"Cancel" results in a blank white page.
"Continue" (regardless of the choice) results in the 403 error (example from Opera):
Any ideas would greatly appreciated!
Glenn