Once you have installed an Apache 2.2 version on Linux system, when open the website on browser shows an error "403-Forbidden", meanwhile check into apache log file using tail command.

# tail -f  /var/log/apache2/error.log 

[Thu May 19 07:01:04.091731 2016] [authz_core:error] [pid 4974:tid 140146236913408] [client] AH01630: client denied by server configuration: /home/previewcdn/public_html/web.config

open your VirtualHost configure file and add below lines.

# vim /etc/apache2/site-available/000-default.conf 

    <Directory />
        Options ExecCGI FollowSymLinks IncludesNOEXEC SymLinksIfOwnerMatch
        AllowOverride All
    Require all granted

Once save that file and restart apache service,

# service apache2 restart