DNS troubles

Hey all i am hosing my own domain name via my server at home. I go through a company called no-ip just in case my IP changes. My website has both 443 (SSL) and normal 80 (HTTP) connections.

It seems to work on and off. Most of the time the page does not come up when trying it into the browser. Sometimes it does.

From no-ip it goes through port 80 and then in my router it goes from 80 to 7777 with the server IP (192.168.9.250)

It seems to give me this error when going to the https part:

The server at zzzzzz.net can't be found, because the DNS lookup failed. DNS is the network service that translates a website's name to its Internet address. This error is most often caused by having no connection to the Internet or a misconfigured network. It can also be caused by an unresponsive DNS server or a firewall preventing Google Chrome from accessing the network.

And for the normal website (going to http://) the error is:

Oops! Google Chrome could not find zzzzzz.net

When i try to goto http://zzzzzz.net:7777 on the server itself it shows me the windows welcome website. It also shows me the same when going to the https://zzzzzz.net.

So what are the settings i am missing in the IIS to cause it to do this in the DNS?