I can access the course but it is not responding at all.
I blame Internet Explorer, please let me know if that's the case so I can look down my nose on it and feel superior.
Either way, try another browser (Firefox/Chrome)
If that doesn't do it I'd try connecting through the Tor network or some other proxy in case there's something between me and Codecademy that could be interfering.
Essentially I would try to switch out the things I'm using to access the site - so that's the browser and the network connection.
Obviously there's the possibility that it was on Codecademy's end, that would be a 'try again later' type of thing. It's more likely that it's on your end or between you though.