With the release of MathJax v2.4, we have switched CDN providers. The MathJax CDN is now combining Google Cloud Storage and CloudFlare.

The majority of page authors and developers will not have to do anything – http://cdn.mathjax.org continues to work as expected.

However:

Important changes for SSL users

The MathJax CDN now provides SSL access at cdn.mathjax.org.

NOTE: The direct Rackspace address will be retired on July 31, 2014.

If you have been using the address

https://c328740.ssl.cf1.rackcdn.com/…

you should switch to

https://cdn.mathjax.org/…

See the MathJax documentation for more information.