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user_z4lxa6
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Originator

Visitor

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6 Messages

Tuesday, October 14th, 2025 11:43 AM

XB8 gateway issue

The XB8 firmware is blocking Xbox

UDP traffic.

My logs show FW.IPv6 forward drops, and the Xbox multiplayer test fails with error 0x000000000000000.

I need IPv6 routing disabled or the IPv4-only gaming profile applied. 

When I search these forums there are a lot of people affected by this and Xfinity seems to not [Edited: "Language"] about fixing it. I have already had a tech come to my home he couldn’t figure it out . Than I was stuck on the phone for 3 hours with advanced tech support and they still could figure it out either . When I check my gateway logs under firewall I can see the gateway blocking the IPV6 port which is what the Xbox gaming console uses to play multiplayer online. I have internet access to the Xbox and can download load games but the multiplayer online is being blocked by gateway. The new firmware xfinity has pushed out to the gate way has caused this issue . I need help 

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1 day ago

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XfinityAmira

Official Employee

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4.6K Messages

2 months ago

Hi user_z4lxa6! Thanks for visiting our Xfinity Forum. We appreciate you being a customer with us, and I am sorry to hear about the issues you're running into with Xbox multiplayer. I see you have tried many avenues of support for this and stated you had a tech out. Can you please tell us a little more about the results of that visit? Did the tech confirm this is not something we can fix? 

 

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user_z4lxa6

Visitor

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6 Messages

@XfinityAmira​  yes I had 4 techs back to back in 4 days to my property they changed my router to a xb8 to xb7 . Also tried a xb6 gateway still getting diag log firewall error FW IPv6 Foward drop, 363 attempts, fire wall blocked . I seriously looking to get a lawyer involved soon since this company can’t come up with a solution considering I have had service issue for 2 weeks now with my gaming console not being able to use the IPV6 port properly on the gateway firmware blocking the traffic . This is just unacceptable at this point . I tried to use my gaming console at several locations that aren’t Comcast and multiplayer functions works fine. 

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2 months ago

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XfinityAmira

Official Employee

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4.6K Messages

So that I can check the notes on your account to determine the results of the tech visits and any tickets created, please send us a Direct Message, user_z4lxa6. Here are the detailed steps to direct message us: 
 • Click "Sign In" if necessary
 • Click the "Direct Message icon” (upper right corner of this page)
 • Click the "New message" (pencil and paper) icon
 • Type "Xfinity Support" in the To line and select "Xfinity Support" from the drop-down list
 • Type your message in the text area near the bottom of the window
 • Press Enter to send your message

 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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2 months ago

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user_z4lxa6

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6 Messages

@XfinityAmira​ this issue is still ongoing with no fix in sight . It’s definitely an engineering level fix . The Tech did all the can do . Here is some updated proof that xfinity service is causing my IPV6 issue which is why my gaming console can’t get into any multiplayer or Xbox live connection 

I’m writing to request escalation and technical review regarding an ongoing issue with my Xfinity Internet service that prevents Xbox Live multiplayer from functioning.

Despite multiple support attempts, my Xbox continues to fail the “Multiplayer Connection Test” due to a Comcast gateway IPv6 routing failure that has been independently verified using the gateway’s internal diagnostics.

Here are the specific details of my testing:

  • Gateway Model: XB8
  • Firmware Version:
    Prod_23.2_231009 & Prod_23.2_231009
    Software Image Name:CGM4981COM_8.1p7s1_PROD_sey
    Advanced Services:CGM4981COM
  • Internet Tier:  2.0 Gbps]
  • Diagnostic Test: IPv6 connection test run from the gateway’s Troubleshooting → Connection → IPv6 Test page
  • Results:
    • ✅ OpenDNS (2620:0000:0ccd:0000:0000:0000:0000:0002) – Passed
    • ✅ Cloudflare (2606:4700:4700:0000:0000:0000:0000:1111) – Passed
    • ✅ Secondary test address – Passed
    • ❌ Microsoft (2620:01ec:0c11:0000:0000:0000:0000:2001) – Failed
    • ❌ Microsoft (2620:01ec:0c12:0000:0000:0000:0000:2001) – Failed
    • ❌ Microsoft Teredo test address (2001:0000:53aa:064c:0000:00fb:1e5f:0032) – Failed

This confirms that the gateway cannot reach any Microsoft IPv6 network endpoints, while other IPv6 routes remain partially functional.

Because Xbox Live multiplayer relies on Teredo (IPv6 tunneling) to establish game sessions, this routing defect completely prevents multiplayer connections, even though all other Internet services work normally.

I have verified that:

  • The Xbox hardware, cabling, and account are functioning correctly on other networks.
  • The issue is isolated to Comcast’s IPv6 path on this gateway.
  • IPv6 cannot be disabled by the user on XB7/XB8/XB6 devices.

This points to a known IPv6 routing or firmware issue within Comcast’s XB7/XB8 gateways (builds prior to v5.2.2).

Please escalate this case to your Network Engineering or Firmware Team for review and confirm whether an updated firmware build or IPv6 routing fix is available for my region.

I am requesting:

  1. Confirmation that this issue is under investigation by Comcast engineering.
  2. A timeline or firmware version number for the fix rollout.
  3. Billing credit consideration for loss of Xbox Live multiplayer functionality.

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2 months ago

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XfinityShawn

Official Employee

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2.1K Messages

 

user_z4lxa6 We can further help you on our end.

To send a direct message, please click on the chat icon in the top-right corner of the screen, and select "Xfinity Support" to initiate a Direct Message. 

Click "Sign In" if necessary

Click the "direct messaging" icon or https://forums.xfinity.com/direct-messaging

Click the "New message" (pencil and paper) icon

Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line

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

Press Enter to send it

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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2 months ago

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EG

Expert

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114.9K Messages

2 months ago

@user_z4lxa6 @XfinityShawn 

Please circle back here and post any possible solutions for the issue here in these open public forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.

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user_z4lxa6

Visitor

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6 Messages

Will do Comcast still hasn’t fixed my issue not even a email with any updates. This company is the worst 

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2 months ago

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hockeytownnate

Visitor

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1 Message

Was there any new update on this issue? I just switched from my own modem to an XB8 and have been regretting it. I’ve had issues on both Xbox consoles and my gaming desktop.

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4 days ago

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user_z4lxa6

Visitor

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6 Messages

Nope Xfinity never found a fix been over 2 months . Still can’t play my Xbox on there [Edited: Language]network. The only thing I haven’t done is buy my own modem . This company is trash wish I could have service from Att . Their customer service is 3rd world country at best !!!! Don’t get there service if you can avoid it 

(edited)

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3 days ago

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XfinityBillie

Official Employee

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3.7K Messages

 

user_z4lxa6 I understand how frustrating it is when you are having network issues. I'm not seeing that you had ever sent our team a DM so we can help you with finding a resolution. We truly appreciate your business and would love the opportunity to assist you further. Please send us a DM to Xfinity Support with your full name and address to get started.

To send a direct message:
Click "Sign In" if necessary
Click the "Direct Message" icon or  https://forums.xfinity.com/direct-messaging
Click the "New message" (pen and paper) icon
The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.
As you are typing a drop-down list appears. Select "Xfinity Support" from that list.
A "Xfinity Support" graphic replaces the "To:" line.
Type your message in the text area near the bottom of the window   
Press Enter to send it

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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1 day ago

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user_n3s50b

Visitor

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2 Messages

3 days ago

I just wanted to comment that I am experiencing the exact same issue. I tried the same troubleshooting steps, hard resetting both devices, disabling firewall, disabling all security settings I could, check that uPnP is enabled, manually port forwarding Xbox/Microsoft ports, etc. and NOTHING is resolving my issue. I agree with the above user, I need the following:

  1. Confirmation that this issue is under investigation by Comcast engineering.
  2. A timeline or firmware version number for the fix rollout.
  3. Billing credit consideration for loss of Xbox Live multiplayer functionality.

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justsam

Contributor

 • 

94 Messages

1 day ago

Get a router that is under your control and not controlled by Xfinity firmware or software pushes.  I do have an XB8 because of a favorable pricing scheme, but I would not consider using it in anything other than bridge mode. 

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user_n3s50b

Visitor

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2 Messages

1 day ago

@user_z4lxa6 did you try using a router that allows you to disable IPv6? I just spent 3 hours with a supervisor technician trying an XB6, XB7, XB8, etc and we tried port forwarding, disabling firewall, manual port changes, etc everything we could think of. The tech was totally stumped, but I’m going to buy a router that allows me to disable IPv6 and use it in bridge mode.

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