The Quest support page can't be reached with a machine. Although a proxy-server isn't used , the error message: "Page can not be shown. Host not found" is shown.
This could be a proxy-problem, but if a proxy is not being used, try to ADD the ip addresses:
... (exactly as written in the two lines above), then it should be possible to reach the Quest support page.
(To lookup the correct ip addresses you can for example use: http://www.zoneedit.com/lookup.html)