Cannot access OWA

If I type in http://sitename/exchange/logon.asp, the login page comes up but there is no login box (where you type the domain/username and password) after I key in the username.

It goes straight to the “OWA was unable to get to your inbox.” page.

In Internet Service Manager, in the Default Web Site properties, I have the redirect to the above URL in the Home Directory tab. Under the Directory Security tab I have both Anonymous and Challenge/Response checked.

In the Exchange folder properties (in Internet Service Manager) under the Virtual Directory tab I have the Local Path “c:\exchsrvr\webdata”. Under Directory Security I have all boxes checked.

Are my settings correct? What happen to the login box?

Thanks in advance for your advice.