Having an issue where OWA is no longer working from outside, but if works internally. This is Exchange 2007 running on Server 2008 with the CAS, Hub Transport, and Mailbox server role.
When users go to https://mail.MYDOMAIN.com/exchange they get an IIS login, once they login to that then they get the OWA login page. After putting in domain\username and password they get HTTP 400 Bad request and page can not be displayed.
The url it hangs at is