My device is offline: Hikvision model DS-7104N-F1

I have DVR DS-7104N-F1 with 2 cameras hikvision, I can view my cameras in local network with my pc and my mobile on wifi connection.
But in external network i can't view nothing.

The raison is that the hik-connect is always offline ? I put dev.hik-connect.com as sever is it correct ?

Can you help me please

Thanks
Mick