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My browser cannot connect to some internet addresses.

For example, using my HPg8 windows 10 (eundv's HP-455-G8's model is RTL8822CE),
addressing www.bleepingcomputer.com,
Firefox replies to me:

"
Hmm. We're having trouble finding that site.
We can't connect to the server at www.bleepingcomputer.com.
If you entered the right address, you can:
     Try again later
     Check your network connection
     Check that Firefox has permission to access the web (you might be connected but behind a firewall)
"

     Try again later: this situation has existed since at least 11AUG24
     Check your network connection
    AND
     Check that Firefox has permission to access the web:
    using my HPg8 windows 10,
    addressing www.yahoo.com,
    firefox replies to me:

"
We're building a new yahoo.com to show more of what's interesting to you.

Yahoo Home
Yahoo Home
Search query

     News
     Finance
     Sports

… <snipped for brevity>

using Dell, ubuntu, firefox, eundv searched www.google.com for:
1/ "how to flush dns cache arris sb10 router"  Firefox replied with:
    a/  https://superuser.com/questions/1543497/how-to-factory-reset-an-arris-surfboard-sbg10-modem =>
    b/  https://community.verizon.com/t5/Fios-Internet-and-High-Speed/How-To-Flush-DNS-Cache-on-Router/m-p/

      1530130 says =>

“

Even if you reconfigure the DNS or power cycle, it will still retain the DNS, proxy settings, and VPN. You have a few options:

#1  Log into the router and release/renew the DHCP.

#2 *Risks!* Factory reset the device. This will remove all settings. If your device isn’t plug and play then you need to know your network information otherwise you will lose internet access. In most case, the router will pull the network info from the ONT, but not always. You’ll need to check your documentation

There can be an issue where you clear the router cache and the computer(s) retain the previous settings! This is the procedure to use:

 

  • Turn off both your router & ONT.
  • While they are off, clear your internet cache from all browsers, and close all browsers.
  • Go to command prompt (cmd) run ipconfig /flushdns
    • Then run ipconfig /release
    • Run ipconfig /renew
  • You might consider disabling or re-configuring your proxy or VPN.
  • Some firewalls such as Comodo or Kaspersky have services that reconfigure your DNS. If this is a work environment, have a security specialist or admin help you. Disabling/Modifying security settings can make you more susceptible to cyber attacks. Check your manufacturer for more information. If you disable your firewall, only do so for a short period of time.
  • Shutdown the computer (if you have CMD still open run shutdown /s /t 10 ).
  • Manually disconnect and securely reconnect your cables from each device into the same port they used before.
  • Allow all the devices to be off for at least 5 minutes. More modern ones are only 30s but some routers seem to retain power longer.
  • Turn on your ONT first, after it has been fully booted and all lights are showing good, turn on your router and make sure its good to go, then turn on your computer.

 

“

In this case to check the issue further could you please help us with your modem WAN IP is that working on IPPV4 or IPV6?

Please login to the modem GUI to check on this.

Please excuse my delayed reply. Had to work around

‘Invalid user, or password, or your access has been locked because of multiple login fails’

(https://community.surfboard.com/sbg10-70/surfboard-sbg10-wont-factory-reset-3518?tid=3518&fid=70 proved helpful).

 

My screen has 3 tabs on its top row: Configuration, Operations, and Logout.

 

Configuration has 9 sub-tabs on the screen’s 2nd row: Basic setup, WAN settings, LAN settings, Wireless 2.4GHz, Wireless 5GHz, Firewall, USB, Utilities, and Extender. Each of those 9 sub-tabs offer multiple pages of data. Some of the pages have clickable elements, which offer 1/ additional info, or 2/ short cuts to other pages.

 

My Operations tab exposes two pages: Login, and Configuration.

 

My Logout tab simply performs a logout function.

 

Looked on every page for “modem WAN IP”. Used Firefox’s search to assist search. Did not find “modem WAN IP”.

 

Knowing how ipv4 has a different format than ipv6, saw how most addresses were ipv4, but also saw ipv6 addresses here and there, sometimes together on the same page. For example, tab LAN settings, page Client list displays both ipv4 and ipv6. Another example, tab LAN settings, page LAN settings displays both ip formats, but ‘Enable ipv6’ is unchecked. Similarly saw that ‘Enable ipv6’ is not enabled under tab WAN settings, page Static ipv6, even though there are ipv6 entries on that page.

 

Good news is my ‘connects failed’ has gone away. Maybe due to factory resets working around login fails?

 

In summary, generally would wish for zero ipv6 1/ coming into my LAN from the Internet, and 2/ zero ipv6 within my LAN, and in my paranoid mind, my SBG10 seems to filter very little. Now that I’ve found surfboard community, I’ll look for some advice along those lines.

 

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