Hello,
Okay so the DNS is working properly on your end, and there's no need to flush your computer's DNS entries.
I searched online for the two error messages you saw, and found the following:
http://forums.macrumors.com/showthread.php?t=380238
http://discussions.info.apple.com/me...ageID=10324914
Can you try to use Firefox or IE instead of Safari?
Titus