Access to Directory

Hi everybody,
I have a Linux box runing Apache 1.3.6 with 2 ethernet cards, one with an oficial IP and other with internal IP. If I try to get something like this URL all work OK, but if I try to get something like URL I get the message

HTTP Error 403

403.2 Forbidden: Read Access Forbidden

This error can be caused if there is no default page available and directory browsing has not been enabled for the directory, or
if you are trying to display an HTML page that resides in a directory marked for Execute or Script permissions only.

Please contact the Web server's administrator if the problem persists.

Thanks.

Check the options in the <Directory> block for your external IP, or the one within <VirtualHost> block.

Start here -> http://httpd.apache.org/docs/mod/core.html#options

You can begin with Options All or Options Indexes so directory listing is allowed if no http://my.dom.com/directory/index.html is found.