Due to some people having issues with Norton firewall and not knowing how to set it up to allow yDecode to work properly we added this issue to the online troubleshooting help file.
Take a look here (question #6):
http://www.ydecode.com/help/manual_troubleshooting.htm#q006Usually when you get an error like "unable to connect to server" and everything seems to be configured properly like - there is no error in "test config" this could be possible cause if you have Norton installed. Try and let us know if you have some tips to add.