apache - backend and nginx - frontend fixing

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http://serverfault.com – I'm using apache as a backend server and nginx as an front end server, and i've got stuck with configurations. Here a my nginx.conf file and here are my apache2.conf I was doing that some time ago, on my localhost. The problem is i do not have an domain name, i'm accesing this server from it's ip. is there any special configurations for it ? Thanks a lot and sorry for my english, i'm from Romania. (HowTos)