My config is a DNS Server on Windows Server 2008 R2. My domain is on dyndns.org dynamic IP service. This server is a DNS server and a WebServer with IIS. When someone from outside network enter the site "http://domain.dyndns.org" within a webbrowser it is ok, but when someone try to enter "http://www.domain.dyndns.org" it doesn't find any website. So I would like to add a "www." record to my DNS. I did this: Added a A-Type record pointing to my server's local IP. Added a CNAME-Type record named "www" pointing to "domain.dyndns.org." Now I can enter the "www.domain.dyndns.org" from internal network, and it works, but when I enter this address from outside it doesn't work.