I get the following page:
for http://91.140.255.220/
Under Construction
The site you are trying to view does not currently have a default page. It may be in the process of being upgraded and configured.
Please try this site again later. If you still experience the problem, try contacting the Web site administrator.
It is working fine.
I even captured the traffic using wireshark.
I would suggest loading the page from this webserver 172.16.4.2 by opening the browser and typing http://localhost
and see why it is loading the "under construction page".