You're right. I added the following line to my location block:
proxy_set_header Host "my.forced.hostname";
Now I get the expected Site. Thanks for your support.
2013/4/22 Jonathan Matthews <contact@jpluscplusm.com>
> I'm on a sufficiently dreadful connection that I can't examine your
> configs on pastebin. Having said that, I strongly suspect you're not
> propagating a Host header from NginX to your Apache servers. Fix that
> up, and I think you'll have more success.
>
> Regards,
> Jonathan
>
> --
> Jonathan Matthews
> Oxford, London, UK
> http://www.jpluscplusm.com/contact.html
>
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