Multi-site sub-sites not working

I run a multi-site from cloudbestpractices.net, which is working fine, but the sub-sites that sit under it have broken. I had sub-sites at:

http://CanadaCloud.net
http://DigitalGovernment.io

Linked via the Domain Mapping tool.

Now it just shows an empty web site directory..... Help please!

Thanks, Neil.