This was posted on the Mediamax offical blog on 3 October:
We'll be performing routine maintenance this evening from 6PM until 8PM Pacific Daylight Time. We apologize for any inconvenience. We'll have the site up and running again as soon as possible.
Thanks for your business and support!
There has not been any update on the blog of 19 September about the 401 error.
See the quick link at the side for leaving comments on errors in October.