DNS Error - Server cannot be found.

Hi, I purchased a domain on fastHots, I followed this guide to configure dns: http://www.howtoforge.com/how-to-run-your-own-name-server-with-ispconfig-3-and- fast-hosts.
But the problem is that when I go to point your domain gives me this error:

Oops! This page Appears broken. DNS Error - Server can not be found. "

Can you help, I'm going crazy.

Thanks

 

May be because I run the setup last night, and then you have not yet propagated all?

Thanks

 

Yes, it can take up to 72 hours until DNS changes propagate.