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Xfinity DNS Resolution Issues – Comcast XB6 Gateway – Cloudflare Problem

Recently, I encountered frustrating DNS resolution issues with Xfinity due to a problem with the Comcast XB6 Gateway and Cloudflare.

Common Causes of Connectivity Problems

One potential cause of connectivity problems is an outage or maintenance issue with Cloudflare’s DNS service. It’s important to check if there are any reported problems with Cloudflare and if so, wait for them to resolve the issue.

Another common cause of connectivity problems could be related to the configuration of the Comcast XB6 Gateway. Make sure that the gateway is properly set up and configured according to Comcast’s guidelines.

If you are experiencing connectivity issues, try restarting your Comcast XB6 Gateway to see if that resolves the problem. Sometimes a simple reboot can fix issues related to network connectivity.

It’s also possible that there may be interference from other devices or networks in the area causing connectivity issues. Make sure that your gateway is placed in an optimal location away from other electronic devices that could be causing interference.

If you are still experiencing connectivity problems after trying these solutions, it may be helpful to contact Xfinity customer support for further assistance. They may be able to provide additional troubleshooting steps or escalate the issue to their technical team for further investigation.

Troubleshooting Steps for Network Disruptions

  • Unplug both your modem and router from the power source.
  • Wait for 30 seconds before plugging them back in.
  • Allow the devices to fully restart before checking your network connection.

Check Your Network Cables

  • Ensure all network cables are securely plugged in.
  • Inspect the cables for any visible damage or fraying.
  • Replace any damaged cables to ensure proper connection.

Reset Your DNS Settings

  • Open a Command Prompt by typing cmd in the search bar.
  • Type ipconfig /flushdns and press Enter to clear the DNS cache.
  • Try resetting your DNS settings to Google’s Public DNS ( and for a potential fix.

Setting Up Alternative DNS Servers

To set up alternative DNS servers on your Comcast XB6 Gateway to resolve Xfinity DNS issues, you can use Cloudflare’s public DNS servers as an alternative. Here’s how to do it:

1. Log in to your Comcast XB6 Gateway’s admin interface by entering the gateway’s IP address in your web browser.

2. Navigate to the DNS settings section and look for the option to change the DNS servers.

3. Enter the following Cloudflare DNS server IP addresses: and

4. Save the changes and restart your gateway to apply the new DNS settings.

5. Test your internet connection to see if the Xfinity DNS resolution issues have been resolved.

If you continue to experience issues, you can also try using other public DNS servers such as Google DNS ( and or OpenDNS ( and

Remember to keep your DNS settings secure and regularly check for any updates or changes to ensure a smooth and stable internet connection.

By setting up alternative DNS servers on your Comcast XB6 Gateway, you can potentially improve your internet connection and bypass any DNS resolution issues associated with Xfinity’s default DNS servers.

Optimizing Router Settings for Improved Performance

To optimize your router settings for improved performance, you can start by accessing your Comcast XB6 Gateway settings. Once logged in, navigate to the DNS settings and select the option to manually input DNS server addresses. Enter the Cloudflare DNS server addresses ( and to potentially resolve any Xfinity DNS resolution issues. This can help improve the speed and reliability of your internet connection.

After updating the DNS settings, it is recommended to restart your router to apply the changes. Additionally, you may want to consider disabling any unnecessary features or settings that could be impacting your network performance. This could include disabling QoS (Quality of Service) settings or adjusting wireless channel settings for better connectivity.

If you continue to experience issues with DNS resolution, you can also try clearing your browser cache and cookies. This can help resolve any browsing issues related to outdated or corrupted data stored on your device. Make sure to also check for any firmware updates for your Comcast XB6 Gateway to ensure you have the latest software installed.

For further troubleshooting, you can reach out to Comcast customer support for assistance. They may be able to provide additional guidance or escalate the issue if needed. It is important to regularly monitor your network performance and make adjustments as needed to ensure optimal connectivity.

By optimizing your router settings and addressing any DNS resolution issues, you can improve the overall performance of your internet connection. This can lead to faster browsing speeds, smoother streaming, and a more reliable online experience.


How do I fix a DNS problem?

To fix a DNS problem, you can try clearing the cache, rebooting your computer, checking hardware and wires, running a wizard, running an antivirus scan, checking DHCP, and reaching out to experts if needed.

Can you change DNS on Xfinity router?

Yes, setting DNS on an Xfinity router is not possible as the feature is disabled. However, you can manually set DNS on a client device and point it to your own local resolver if needed.

What are symptoms of bad DNS?

Symptoms of bad DNS include being unable to connect to an IP address via a domain name and receiving error messages like “DNS server not available” or “Server DNS Address could not be found.” It is similar to dialing a phone number and getting a busy signal.

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