So you need to make sure www.xyz.de forwards/points to your external IP address used for your ADSL connection.
Next you need to forward port 81 on your router to the server you have with ISPConfig.
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I'm very sorry but I'm not so able to manage this staff now (it's also for my english..).
Forwards/points to your external IP address means the address of the router?
I can forwarding port 81 by use of iptables FORWARD?
Server of ISPconfig is the localhost or server1.example.com?