OWA returns HTTP/1.1 401 Unauthorized

I was trying to configure Exchange for RPC/HTTPS and somehow messed it up  - I am getting HTTP/1.1 401 Unauthorized response from http://xchg.mydomain.com/exchange  -  I disabled SSL  for now but I get the same error... What could be the cause?  I also need an explanation of how to create a certificate properly and apply it to the server so that I can configure Outlook later.  I've done this several times before and never had problems... : [      -  I can go to http://xchg.mydomain.com and I get the Under construction page...
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fredimacAuthor Commented:
Never mind - I figured it out - I changed the authentication all the way down the default web site's virtual directory structure -  doh!

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I think I did the same thing. What did you do to fix it?
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