Urgent: Please!, help me configuring Apache on OS X Server

[stephan]

I have tried tried many different configurations for the apache webserver, but can't get it working properly

- I have a PowerMac G4 with OS X Server 10.2.1.
- The PowerMac has the IP 192.168.0.2 on a local network (nat).
- The public IP is 271.x.x.x
- I have a Netgear router which forwards port 80 on 271.x.x.x to 192.168.0.2 on the local network.
- I'm using the default httpd.conf

How shall i set up the "Web service" in the "Server Settings"?

I have tried to add sites with the following configuration:
- Name: 192.168.0.2, IP Adress: 192.168.0.2
- Name: 271.x.x.x, IP Adress: 192.168.0.2
- Name: 271.x.x.x, IP Adress: 271.x.x.x

None is working

If I leave the "Sites-tab" empty. And sets the ServerName manually to 271.x.x.x in the httpd.conf, it works, but i.e. mimetypes gets fucked up.