Unable to visit a site added to my network

Hi guys,
Just completed converting my single site wordpress site to a multisite, one problem, I have just created my first site, and site does show under "my sites" unfortunately when I try to visit the new site, it comes up with the error message below;

Sorry, the website approvedcarcare.carcaremagazine.com cannot be found

I assume I may need to change some settings, if this is the case could somebody point me in the general direction of what needs doing, also will these changes create problems with my original "main" site

Regards Andrew