It is for Germany users only... You should return it to the shop and buy TD-W9980 instead.

DNS configured on your local NAS/server is LAN IP address of C9? You can access them locally with their LAN IP: port?

Firmware version is up to date? You can login its web interface and finish the setup, and then, you cannot login the web interface, right? How about status of all lights after step 4? Can you find...

Yes! No worries...

Hi Ermiek, check Internet and DSL section on Status page if the problem continues. I'm not asking for screenshot of DSL Settings page...lol

Configure bandwidth control. Or disable UPnP. Firmware of your W8970 is up to date, right?