Hi,
suggest updating the firmware on DVR and using the Hik connect app with p2p networking function.
If you don't want to update firmware then check open ports using yougetsignal.com and see if ports 80, 8000 & 554 are open. If they are then the issue is with Hiddns not linking. You can manually enter a primary DDNS as 8.8.8.8 & alt DDNS as 8.8.4.4. this is on the dvrs configuration menu & networking
Suggest using dyn.com which is another DDNS service as you can't add any more devices to hiddns .
If you choose to update firmware and P2p function then watch these two videos ( choose hikvision remote viewing setup) http://www.cctvwholesales.co.uk/support-hikvision.html#
Also, try the DVR directly connected to the router without any repeaters in case its the reporter that's the issue.
