Uptime feature understanding….

Hi,

Nice the new features for members.

When trying the uptime feature I get this message by one of my sites:

Your domain does not appear to be publicly accessible on the Internet.

I donot understand it… it appears when trying to activate it to the site h4bs.com…

but for the site shop.h4bs.com it is working….

How can I get it working for both of them.

Thanks!