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user_7gh44g
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Tuesday, April 28th, 2026 2:21 PM

DNS settings in Admin login

I need to understand why the ability to change DNS settings, for someone who is an IT professional, has been turned off. Got new modem because previous modem (only lasted a year) all the sudden had port issues. Go to direct my DNS to my DNS provider and find out that the service has been locked down, and we can no longer access or change DNS settings

How do we get this unlocked, as I dont want to use 75.75.75.75 as my DNS

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2 days ago

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XfinityMichaelC

Administrator

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5K Messages

20 days ago

Hello @user_7gh44g! Thank you for reaching out via our Xfinity forums!


I certainly understand the importance of having the flexibility to utilize your preferred DNS servers. Currently, DNS settings are locked on our gateways to support integrated network features, such as Advanced Security, which functions by monitoring DNS queries for potential threats.


To work around this limitation, you have two primary options:

  • Enable Bridge Mode: You can place your gateway into Bridge Mode and connect a personal third-party router. This allows you to manage DNS and all other networking preferences directly through your own hardware.

  • Manual Device Configuration: You can manually assign DNS addresses on your individual devices (PCs, tablets, or smartphones). These local settings will override the default DNS provided by the gateway.

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user_kpdu09

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4 Messages

So If I don't want the advanced security can I change DNS ?

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4 days ago

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EG

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118K Messages

4 days ago

@user_kpdu09 

No. Those two functions are not interoperable / interchangeable.

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user_kpdu09

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4 Messages

Could you provide me the official formalized statement from Xfinity saying what they use my DNS service usage data and who all have access to it.

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4 days ago

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EG

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118K Messages

@user_kpdu09 

I can't, as I'm not an employee, sorry. Perhaps an official employee can. Good luck with that !....

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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4 days ago

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user_kpdu09

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4 Messages

Ok, sorry I didn't knew. In that case we both know what's going on

(edited)

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4 days ago

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EG

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118K Messages

No worries ! 😊 😉

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

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4 days ago

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XfinityJustinM

Official Employee

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741 Messages

Hello @user_kpdu09,

I would be unable to confirm any details regarding who would have access to any DNS details, but I can assure you that permissions are very limited within comcast as that is one of the best ways to protect information. Domain Name System Security Extensions, otherwise known simply as DNSSEC, is an enhanced level of Internet security that allows websites and ISPs to validate domain names to ensure they are correct and that they have not been tampered with.

For example, with DNSSEC, a website name such as www.xfinity.com can be cryptographically signed in the Domain Name System (DNS). Then, when you try to connect to that website, the Comcast DNS servers check that the domain name and its security signature are verified and have not been tampered with by hackers or other criminals. You will only be connected if this security verification has been passed, which occurs so quickly you should not even notice that it is being performed. This prevents hackers from injecting false information (aka DNS cache 'poisoning'), to attempt to re-direct people trying to access a real website to a fake, phishing or criminal site.

You may also find the Customer Agreements, Policies & Service Disclosures page helpful as you aim to learn more. 😃

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 days ago

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