make sure you have portforwarded correctly, and when you run the server go to [Only registered and activated users can see links. ] and test the port you are using to host the server and if it says its online/working it should just connect correctly.. make sure you have changed the client ip too.. and activated/turend on the no ip duc host.
and you NEED TO MAKE SURE that you have also gone to firewall settings and then advanced firewall settings, then opened the port inbound and outbound..
if you have all those working.. then tell me if it still didnt connect and i will help you more..