Solution is just simple.
If you are trying to access server using your local IP address and you are getting error saying like Forbidden You don't have permission to access / on this server
Just open your httpd.conf file from (in my case C:/wamp/bin/apache/apache2.2.21/conf/httpd.conf
)
Search for
<Directory "D:/wamp/www/">
....
.....
</Directory>
Replace Allow from 127.0.0.1
to
Allow from all
Save changes and restart your server.
Now you can access your server using your IP address