Brave BrowserThe Brave browser displays all websites as "Not secure" /"This connection is not private"

@NicolasL ,

Exit / Quit everything.

Manually back up your Bookmarks - use the Brave Browser Bookmarks Manager to export - thus creating a “bookmarks . . .html” file – and place that file in a directory, other than in the BraveSoftware folder path.

And, back up your BraveSoftware folder:

Windows OS:

%LOCALAPPDATA%\BraveSoftware\Brave-Browser\User Data\Default\

When ready . . .

Use Microsoft Edge and go to:

https://www.avg.com/en/signal/proxy-server-definition

Scroll down to “How to find your proxy server address in Windows” . . . and double-check, to see if your Windows OS machine is using a Proxy Server.

Note: After following those steps, also use a Brave Browser > New Window, and go to: brave://settings/?search=proxy . . . and double-check, that method of going to your computer’s Proxy Settings.

Next, using a Brave Browser > New Window - go to brave://settings/security

Disable: Use secure DNS

Next, using the Brave Browser > New Window, go to: brave://settings/cookies

Disable: Clear cookies and site data when you close all windows

Next, using the Brave Browser > New Window - go to brave://settings/clearBrowserData . . . and select the Clear browsing data > Basic tab.

Enable all 3 selections and click the “Clear data” button

Return to: brave://settings/clearBrowserData

For tab On Exit

  • Disable: Passwords and other sign-in data
  • Disable: Site and Shields Settings

Click on the “Save” button.

Double-check the DNS server numbers that you are using for your Windows OS machine’s connection to the Internet:

https://www.windowscentral.com/how-change-your-pcs-dns-settings-windows-10

Free and Public DNS Servers:

https://www.lifewire.com/free-and-public-dns-servers-2626062

Next, in a Brave Browser > New Window, go to brave://net-internals/#dns and click on “Clear host cache”

Enter another Brave URL brave://net-internals/#sockets and click on “Close idle sockets” . . . and then click on “Flush socket pools”

Exit / Quit Brave Browser

Exit / Quit everything else and Restart your Windows OS machine.

Notes re what are:

DNS cache:

Socket pool:

With pooling, instead of closing a connection after it is used, we can keep it idle while it waits to handle another request. This saves the resources required to create a new connection.

Very easy, plain website that simply displays DNS status:

https://test.nextdns.io