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27 Messages

Wednesday, April 16th, 2025 3:04 AM

Packet Loss on a New XB8-T +install

I signed up for 800 mbps service last week and the tech came out to install the modem. Even though they are seeing 800+, when I do a speed test on a PC as the only connection to the modem, I get speeds of 360 max. I am using PingPlotter to look for packet loss and I'm seeing tons of it. AT the modem and at various hops along the way. Here's a typical report.

When I call the Xfinity "help" line, the support people don't know what Packet Loss is. Their solutions are for me to upgrade my service, or to just go away. I've been having buffering and glitches with all streaming services, even podcasts for several weeks. My initial contact about this was last week and his solution was to upgrade my service, so here I am, a week later with the same issue. How do I get this fixed? Mike

Official Employee

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2.2K Messages

1 month ago

 

user_0ejd3b

Thank you for reaching out. I hope you are doing well today, despite the issues with the network. I understand that at the time of the installation, the tech captured full speeds, but you have yet to see this on your end. Additionally, you've seen gradual packet loss affecting videos, streams, and podcasts. I'm sure this has been frustrating. I appreciate you bringing this to our attention and creating a new post. 

I did check the levels at home, and I did see the upstream RX power wasn't up to par, but I didn't see any other red flags yet. Are you able to provide a screenshot of your most recent speed to gateway test? 

 

27 Messages

@XfinityVianney​   302Mbps is about as fast as I've seen. It's usually in the sub-150 range.

I need to reduce the reduce the resolution to 720p to be able to watch a Netflix movie. Not good.




(edited)

27 Messages

fyi these were done with everythinng freshly power-cycled.

Official Employee

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1.3K Messages

@user_0ejd3b thank you for the additional screenshots and information. When you are experiencing the buffering when streaming or listening to podcasts, are those all the same device? 

From experience, I had an older laptop that had speed/connection issues. Got a new laptop at the beginning of the year, and have seen a huge improvement. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
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27 Messages

26 days ago

I have tried connecting a high-end i9 windows PC to the modem, with this being to only connection. There is no improvement. I suspect that the issue is with the Comcast servers.

Official Employee

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1.3K Messages

@user_0ejd3b appreciate the update of the device your testing on, just wanted to rule that out as possibility. I'd definitely like to investigate further and want to ensure the modem is provisioned correctly, or if I can see any signal issues coming into the home from the area equipment. 

Since I will need to gather information to locate your account that we don't want here in our public conversation. When you have time, please send a direct message. 

To send a direct message: 

 

Click "Sign In" if necessary

 

• Click the "Direct Message" icon in the upper right - it looks like a chat bubble  

• Click the "New message" (pencil and paper) icon just to the right of Conversations

• Type "Xfinity Support" in the "To:" line - do not use the Employee's name!

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

• Press Enter to send it

To expedite your request, we ask that you please include your name, the account holder name (if different), and the service address

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

27 Messages

have also connected the tv as the only device connected to the modem and I still get massive data droputs. I have to adjust Netflix to 720p in order to see anything on my 4k tv. There is an Error Message box on my LG tv that reports lack and resumption of ethernet data, and this thing goes on and off every 4-5 minutes, even with nothing streaming.

Official Employee

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1.3K Messages

@user_0ejd3b that's helpful to know as well. And based on the 800 MBPS speed you said you should be on, it shouldn't need to have the resolution speed lowered as it should be able to support higher resolution video. 

It looks like our communications may have crossed paths when posting. Once you're able to see my previous reply about the direct message, please follow with the requested info, and I'll be able to start troubleshooting. 

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

27 Messages

I normally only use one steaming device at at a time, either our living room TV, or a music streaming device (Alexa), or a PC running Youtube, but practically never simultaneously.

Official Employee

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1.3K Messages

@user_0ejd3b the 800 MBPS download can support up to 11 devices at a time, so can definitely handle the number you would be running at a time based on you saying you're typically only running 1. 

I'll watch for the DM to be sent, when you have time. 

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

Contributor

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124 Messages

26 days ago

I posted about this a page back.

27 Messages

DM sent Friday @ 4:20 EDT.

27 Messages

22 days ago

The Xfinity speed test shows 150.6Mbps today. What are next steps?

Contributor

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124 Messages

21 days ago

Not sure if you know but they can actually see the speeds you are testing at on the Xfinity speed test site on their end. So, they should be aware something is wrong.

27 Messages

Thanks. How can I access the ticket to see if/when progress is being made?

Contributor

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124 Messages

@user_0ejd3b​ the sad thing is they won't tell you. I have managed by using the chat bot to get a call back from an American!! It has been them who have brought up my speed test results and so they file a ticket. I have heard back once and that was from an Engineer who emailed to tell me they found the problem which took them a while. I would have to believe that the ticket is put in and there is no real tracking as if there was just logistically trying to have a program track them etc. is a nightmare with as many subscribers there are. I understand it is frustrating but with so many complaining personal service is not really available.

Official Employee

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2.2K Messages

 

user_0ejd3b, I'll be glad to check for any progress. Plesae follow up via direct message, and we can continue our conversation. 

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

27 Messages

This is completed. What are the next steps?

27 Messages

15 days ago

New info for you. (I know this is company policy so I'm not blaming you. Just the opposite -- I know how big companies are, and I appreciate your help.)

When I initially went online @ Xfinity to get help about 3.5 weeks ago, I had been having these same connectivity issues for the prior 3-4 months. Eventually, the data loss was so great, that I worked through the Xfin site and talked to a chat-based technician. He said that he could see that my modem was old technology (it was working great 4 months earlier) and I needed to upgrade to a higher tier of service, which included a "current" modem. At that point, I had no choice but to upgrade. After the new modem was installed, and both on-site techs said that they did the best they could, we are still seeing the same problem I saw before upgrading. I seem to be getting a very choppy 150Mbps going through Comcast servers.

After I discovered that the new modem didn't help, I talked to tech support 3 more times and they all said that was they checked the modem and I needed to move up to a higher tier. This leads me to believe that I never needed a new modem at all and I was conned into upgrading on that very first call.

Mike

Official Employee

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1.3K Messages

I am sorry the issue is still ongoing despite upgrading the modem. This may sound either redundant or something simple, but it has at times been the cause of issues. Is your equipment connected to a modem?

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

27 Messages

Everything is currently connected to the new XB8-T. I can easily change this configuration for testing if we can get coordinated.

Official Employee

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2.5K Messages

Great! I'll respond going forward in direct messaging to troubleshoot this issue and provide the proper assistance for resolution. 

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

27 Messages

Have you seen my screen shots showing the lossy Comcast servers between me ans the outside world? I can send them again.

Official Employee

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2.1K Messages

I believe so, @user_0ejd3b. Are you referring to the screenshots you posted here on April 15 and April 23?

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

27 Messages

13 days ago

This shows an 85% packet loss at server "be-501-arsc1.capitolhghts.md.bad.comcast.net". This was reported three weeks ago. Why has this not been addressed?

Contributor

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124 Messages

13 days ago

I get the same run around. I was told my plan was obsolete and had to downgrade and it was which I thought was funny as i had been at 13.gbps for years and then had to drop to 1100mbps or the same price and the website showed 1.3,gbps was discontinued. Then a month later I called and was put back on 1.3 Gbps for $15 a month cheaper. So to tell you the truth I don't t many people have an clue on what is going on at the backend.

27 Messages

Unbelievable, right?

27 Messages

13 days ago

I've been working with Xfinity for almost 30 days trying to resolve a data loss problem that makes my new Xfin modem practically useless. (I have an 800Mbps plan with their newest modem, however all streaming services glitch to the point where my devices crash.

I have been handed off to ~15 techs and none of them know what to do. I have to re-explain the problem every time. My issue is beyond the knowledge base of the standard Xfin tech. I need an engineer to take a look at the issue and resolve this mess. How can we make this happen?

Note: This comment was created from a merged conversation originally titled I've been asking for support for 30 days and have been ignored

27 Messages

Just in the past several days, the following techs have given up and handed me off:
XfinityJustinM

XfinityVianney

XfinityVictor

XfinityEricB
XfinityJustinC

XfinityNatalie
XfinityThomasC
XfinityJamesC

XfinityKei

27 Messages

The latest reply from XfinityKei. I've been hearning this [Edited: "Language"] for a month now.


My apologies for the delay. I am showing your area has techs currently working on some connection issues. I would like to monitor your account until the tech have completed heir work and check in to see what speeds you're getting and your overall connection. If you're signed up with our text alerts you should receive a nonfiction from us about your connection. Our free XFINITY App is also a great place to check on the status of your connection as well. Our apologies for the inconvenience this has caused you. Our team will check back in with you shorty.

27 Messages

What exactly are the field techs doing?

27 Messages

13 days ago

COMCAST SERVER "be-501-arsc1.capitolhghts.md.bad.comcast.net" IS BAD. The top large red area at the bottom of this screenshot shows practically continual packet loss

Note: This comment was created from a merged conversation originally titled How do I report a bad server?

(edited)

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