Installing Multi-Site (hostgator) Need help please!

I have installed mulit-site on my shared hosted site and have added my first subdomain.
I can access the dashboard etc from inside wp but when I try to go directly to the subdomain it says:

server not found:

I setup a wildcard * in hostgator:

The main domain is:

My test subdomain is:

Can anyone help me?

Is there more I need to do? Is there some time required for the new subdomain to become live?

Thanks for any help.