I work in a school in Buckinghamshire, England and we would like to use Codecademy to teach Python and other languages. I can log in and start a Python tutorial but then it hangs and I just get a spinning wheel. I have unblocked a number of URL's including
but it is still happening. It works fine on a school computer on an ADSL line, so it looks as if the problem is caused by the firewall at our ISP.
Are there any other URLs, port or protocols that need to be unblocked to allow codecademy to work?