OWA Forms Based Authentication

I recently enabled FBA on my Exchange 2003 server.. now I'm getting prompted twice, onces with the regular non-FBA popup, then a second time after authenticating the first popup using the FBA form.

What have I misconfigured?
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Ben HartAsked:
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Glen KnightConnect With a Mentor Commented:
This is normal if you don't have a front end server and the user tries to login to the wrong exchange server.
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Glen KnightCommented:
How many exchange servers do you have?
If you have more than one then you should have a front end server.  You only need to enable FBA on the front end server.

Do you use ISA? If so you should only enable FBA on either ISA or Exchange see my blog here: http://demazter.wordpress.com/2010/02/09/publish-exchange-services-with-isa2006/
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Ben HartAuthor Commented:
I do not use ISA (hate it actually), and yeah we really should have a front-end  but we're using the dual DNS pointer routine.  i.e. webmail and webmail1 pointing to different hosts.  However webmail is the only one with a 3rd party SSL certificate at this time, so I went into the ESM and enabled Forms-Based authentication.  After bouncing IIS I now get two promots when attempting to login externally.
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Ben HartAuthor Commented:
So if I browse to "webmail.domainname.com" Im presented with the non-FBA popup.. i login with a user that has an account on the server webmail is NAT'd to I get another auth prompt in FBA form.  How does that even work when I havent authenticated yet?
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Glen KnightCommented:
Ahh, that's different, sorry I thought you said you were getting 2 FBA prompts if your browsing to the site and getting a windows type authentication then the authentication methods on the Exchange virtual directory are not configured correctly
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Ben HartAuthor Commented:
Ok cool.. what "should" they be if your wanting just the FBA screen?
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Ben HartAuthor Commented:
Any clues?
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