Did this ever get resolved? I purchased the exact same model modem (MB8611) and have the same issue. I called last night to have modem activated remotely, but the non-US team needed to escalate to US team and it was off-hours. Curious if you ever got the MB8611 to work. I tried manually setting DNS addresses, static IP addresses to match my old modem. No dice. I would occasionally be able to access the cox.com/activate page, and less frequently able to access the next page after hitting "activate modem". Mostly got page unable to load errors (either request timeout or no connection available).