I see...
If your hard reset doesn't work out for you I would honestly suggest getting a new router rather than have the double setup you have. My friend has an identical setup to you (different router types but same setup) and can't connect to people in CoH without playing directly through the router closest to the hardline, in your case the ambit. When he does this, no one else can access the net in his house and I still had to configure his port forwarding.