This is a default fallback page served where the the server is unable to determine which site you wish to access on this server.
If you are accessing this page from an https:// link, then it is likely that your browser does not support Server Name Indication (SNI) - examples of such browsers are Internet Explorer on Windows XP, Mozilla before v2.0, Safari on OSX before 10.5.6. You can read more about this on the Wikipedia article about SNI where some indication of browser support is given.
I strongly suggest that where possible, upgrade your browser or use a suitable alternative to view the site you are looking for. Alternatives include:
Firefox (Mozilla Foundation)