This is the server's default page. You may be seeing this page for a number of reasons.
You have specifically navigated to the server's hostname
You have navigated to a domain which...
may have changed IP address recently - If that is the case, the change can take several hours to propagate. You can following these instructions to clear your DNS cache which should then allow the new, correct IP to be found.
may have moved or been terminated from this server - This domain may no longer be hosted on the server. Perhaps it has been transferred to a new server. Or the domain name has changed and you are visiting an old address.