I answer myself (just in case somebody needs the info one day):
I tried
- minidlna, which is really cool, since I can configure it with a decent .conf file in /etc - but minidlna does not rescan my collection
- mediatomb, which worked flawlessly until the next reboot. I hdn't installed the deamon
but in the end I figured out, thta my denon works perfectly with squeezeboxserver (Logitech media Server), which I alredy had installed. So I am content with this solution, since my collection runs with one server only. Thats seems also easier with the rights.
