It's first time I'm using zoneedit dyndns using my domain name associated with my local ip address. Sometimes the access to the website works fine, but the most of the time, the Err_Connection_Refused appears. Which aspects I have to test?
The hard work was detect where the access to my website have been interrupted. I also tested telnet without success. Finally, googling I could enter in my modem configuration panel which was blocked by the ISP. I managed to configure the redirection of requests from the internet to my website, using port 80.