Visitor

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1 Message

09/17/2026 5:19 PM

Customer-owned MB8611 stuck in Xfinity walled garden despite successful DOCSIS connection

I have a customer-owned Motorola MB8611 DOCSIS 3.1 modem.
The modem shows Network Access: Allowed, Boot State: Operational, Configuration File: OK, all downstream/upstream channels locked, downstream SNR around 40–43 dB, downstream power around +6 to +8 dBmV, and upstream around 42–46 dBmV.
My router receives a WAN IP, gateway and DNS.
However, normal Internet traffic is being redirected to Xfinity's registration/walled-garden infrastructure. For example, requesting reddit.com returns an SSL certificate for susi.comcast.net, susi.xfinity.com and register-wg.xfinity.com, causing SSL_ERROR_BAD_CERT_DOMAIN.
Phone support has repeatedly reset/reprovisioned the modem without resolving it. The CM MAC has been verified, and Xfinity confirmed my previous inactive account no longer has a modem associated with it.
Can Digital Care please check the modem's bootfile/provisioning state and whether it is stuck in the walled garden, and escalate the backend provisioning if necessary?

Thanks

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Expert

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121.2K Messages

5 hours ago

Concern moved here to the Customer Service help section for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance.

Official Employee

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3K Messages

4 hours ago

 

user_787owi, thank you for reaching out through Xfinity Forums. We would be happy to take a look at your bootfile and see what needs done. 

Please send us a DM with your name and address.

Here are the detailed steps to direct message us:

1. Click "Sign In" if necessary.

2. Click the “Direct Messaging” icon.

3. Click the “Start new conversation” (pencil and paper) icon.

4. In the “To:" line, type “Xfinity Support”.

5. As you type, a drop-down list will appear. Select “Xfinity Support” from that list.

6. An “Xfinity Support” graphic will replace the “To:" line.

7. Type your message in the text area near the bottom of the window.

8. Press “Enter” to send it.

https://forums.xfinity.com/conversations/guidelines/how-to-direct-messaging-within-the-forum/697ba1e570934d009185c514

 

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