I used sudo. I now have tried two approaches: change the port, use my user as ServerId. At first, it worked, however, after every kill (or reboot) the previously working port doesn't get bound. I now have tried 3 ports. At first they were working, then I killed or restarted and the I got an "Error binding".
The filesystem access I tried to circumevent by creating a symbolic link in / pointing to web and assigning 755 to that symbolic link (as I don't know wether everything above web needs 755 too).
So I got it working once. Now it's not working after the reboot.
Lars