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gottchilds
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Tuesday, February 10th, 2026 10:42 PM

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400 bad request on chrome

I keep getting this "400 Bad Request Request Header Or Cookie Too Large" error on Chrome. I have cleared the cache and cookies multiple times.

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3 hours ago

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XfinityThomasA

Official Employee

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3.7K Messages

5 months ago

 

Hello, gottchilds! Clearing cache and cookies is a great first step. Are you having this issue on just one device or are others impacted? What happens when you try using another web browser?

 

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user_2syayi

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All devices are now impacted.   I cant look at my plan on the app or on the website.  I cant look at it on my laptop either.  

4 months ago

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XfinityOrlandoM

Official Employee

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3.6K Messages

@user_2syayi

Thanks for reaching out to us, you may want to try clearing your caches and cookies and also resetting your default Internet settings.

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 as Best Answer.tick

4 months ago

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SgtPepper42

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@XfinityOrlandoM​ What a horrible suggestion.

3 months ago

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ibamountaineer

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4 Messages

5 months ago

This is a Xfinity problem.  Search the web and you will find numerous posts about this problem.  For an internet service provider xfinity has a miserable website and connection.  Constant proble they try to blame on peoples computers.  Funny how you do not have this problem with other websites--just xfinity.

2

MurphyBuck

Visitor

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1 Message

I totally agree with you, all other websites on my computer work just fine except when  logging into Xfinity/Comcast website. It’s a once a week problem and it’s been this way for years. Maybe it’s time for me to go somewhere else.

3 months ago

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XfinityJeniece

Official Employee

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4.2K Messages

Thanks for confirming those details @MurphyBuck. We definitely do not want to lose you as a customer. What browser are you currently using?

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 as Best Answer.tick

2 months ago

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user_1xshxj

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1 Message

4 months ago

I am also experiencing this issue, on every browser with the xfinity website.

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user_fd504c

Visitor

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4 Messages

4 months ago

same here, so tired of this error and having to call them and be on the phone for hours

no problems on other websites

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XfinityOrlandoM

Official Employee

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3.6K Messages

@user_fd504c

Thanks for reaching out to us, we recommend clearing your caches and cookies and also going into your settings and going to the “reset setting” option and click on “restore setting to their original default’s”.

 

Also try using incognito/private mode to see if the error is caused by browser extensions.

 

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 as Best Answer.tick

4 months ago

0

user_7yp6bk

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1 Message

I am getting the same error on the Xfinity mobile app on Android. 

1 month ago

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XfinityAbel

Official Employee

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444 Messages

@user_7yp6bk thanks for taking the time to post on our Xfinity Community Forums page. If you've already cleared the cache and cookies the next step would be to ensure that your phone OS and the Xfinity app are both on the most updated versions. If you've already ensured they are up-to-date, try uninstalling and reinstalling the app. Let us know if that helps.

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 as Best Answer.tick

1 month ago

0

user_uuqci8

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1 Message

18 hours ago

How to clear my cache 

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EG

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119.5K Messages

3 hours ago

@user_uuqci8 

Please create a new topic of your own here on this board detailing your issue. Thanks. The original poster has not returned. 5-month-old dead thread is now being closed.


For future reference, it is better to submit your own post as it creates a ticket to get help, and posting on someone else's older thread can delay getting help.

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