OWA external authentication issue


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
https://mail.MYDOMAIN.com/owa/auth/owaauth.dll 
IThackAsked:
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debuggerauCommented:
check your OWA auth in the console, you may find it is set to username & password not, DOMAIN/User & password, or user@domain & password..
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MikeGGGCommented:
Try https://mail.MYDOMAIN.com/owa
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LeeDerbyshireCommented:
As previously mentioned, you should be using /owa for E2007, not /exchange.  But if you really, really want to be able to use /exchange, have a look at the properties of the Default Web Site on the server, and make sure that a Host Header value is not configured, and that it is listening on 'All Unassigned' IP addresses.
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