1) I do not have a domain name configured yet. I use a public IP address but the server gets an internal IP address (192.168.1.4) with ports 80, 22 etc. forwarded. So when I write http://192.168.0.10/mydomain.com/web/
I get the 403 error.
2) I guess then everything is ok with chrooting. You are right, it is not the same /etc directory as server's.