I've added the config lines for the virtual host to my apache config file, set up foler structure, created the digest file to use to authenticate. Only problem is that when I have the lne pointing to my authdigestfile in the config file httpd won't start. I can comment it out and it will run, but then I have no security at all and I can't go any further in the DIY .Mac tutorial.
Most likley you've to install and activate the mod_auth_digest apache module.
I already checked that; its both installed and activated in my httpd.conf file.