After a recent Microsoft
Windows Update, you can no longer login to a session in either the
ControlCenter or on thedirect url (http://mail.domain.com). User is
given a "Login Failed... Try Again" message.
IE, click on "Tools" then "Internet Options". Click the "Privacy" tab
then the "Advanced" button. Check the box next to "Override Automatic
Cookie Handling". Set First Party Cookies to Accept, Third Party to
whatever you'd like. Check the box next to "Allow session cookies".
Click "OK" twice, then refresh the page and try to login again.