Im a N00b on this so have mercy..

I have have an ASUS RT-AC66U Router, with software version 3.0.0.4.380_7378
I also have activate DDNS client and set-up OPENVPN settings.
I haven't change anything in the advance settings in the OPENVPN settings in the router.
I have export a configuration file to my iphone an open it with the OpenVPN app.
I add the profile but when i try to connect from my iphone it says waiting for server and after a while it says connection timeout..
(No bytes in only some Bytes out)
Anyone got a clue what im doing wrong ?