> A domain with an german 'ä' wont work.

This[1] wiki article should explain it. You could try to use encoded
domain name in nginx config files.
(bratwürst.de <--> xn--bratwrst-b6a.de)

Regards,
Joost Molenaar

[1] http://en.wikipedia.org/wiki/Internationalized_domain_name

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