I am trying to setup an alias to point to some directory on my filesystem not in DocumentRoot. Now I get a 403 Forbidden response. These are the steps taken:
1. edit http.co
Check permission on /Users/user/Documents/, /Users/user/ (higher level permissions are enforced first ...)
/bin/su into the user running Apache (like www, www-data) and cat a file in the /Users/user/Documents/example directory. That might point you to permission problems with your setup.