[Dingobloo]

An update on this, someone on the bnet forum was in contact with Blizzard's cloud service provider in an attempt to fix the problem:

EdgeCast believe they have now fixed the issue with their server (68.232.45.253). I can confirm it now works for me without the DNS workarounds.

If you had previously changed your DNS settings or modified your hosts file, can you try undoing those changes, and then see if you can play SC2 now? A good test would be:
1. Close SC2
2. Undo the DNS or hosts file changes
3. Make sure "ping us.depot.battle.net" reports 68.232.45.253
4. Check that you can download http://us.depot.battle.net:1119/000000test.txt
5. Run SC2 and log in to the US server
6. Make sure you can start a quick match
7. Try to create a custom game for a map you haven't played before, or play an Arcade game you haven't played before

Source: http://us.battle.net/sc2/en/forum/to...8411977?page=9

If you've undone the DNS or Host file changes and are still having issues on the US server, please follow the instructions in this post and post the results in the thread so that they can continue to track the issue.