OK, I'm the anti-Microsoft religious nutter, but it sounds to me like your problem is with your ISP. Typically this happens when they have a glitch with their DNS setup, or they configure a new server and it takes a while to sort itself out.
Try this link:
http://69.63.133.132/
if that takes you to climbto350 and
http://www.climbto350.com doesn't, that diagnosis is correct.