Well I have been testing this further. What I have found is that the issue
is really not autodiscovery. When the device initially tries to connect it
uses autodiscovery but when that fails, you are presented with several
boxes to type in the server name, domain name etc. At this point, when I
put in all this information in the iphone, and click next, I get the error
: Unable to verify Account. What bugs me is the Android works fine. I have
added now about 15 android phones and they all work just fine with nginx as
a reverse proxy to exchange. I can't imagine what the iphone is doing
differently. I have been scouring through logs to try and figure it out but
nothing yet.

On Sat, Jan 17, 2015 at 3:56 PM, itpp2012 <nginx-forum@nginx.us> wrote:

> I might have read it wrong but it seems that you could create fake files
> the
> device is looking for or just return a 200 for such requests.
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,256151,256165#msg-256165
>
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