Browser
ERR_INTERNET_DISCONNECTED The browser thinks you are offline
What it means
The browser did not see a working network route and did not try the site in the ordinary way. This is a local or network condition, not a message from the website.
Where you usually see it
A laptop with Wi-Fi turned off, a phone without a signal, a captured portal on public Wi-Fi that has not been accepted yet, and a VPN that has dropped.
What to try first
Check the machine's network icon, try a known site, and, on public Wi-Fi, look for a sign-in page. If a VPN is on, try once with it off (unless you need the VPN to reach the site). Then retry the original address.
When to stop
This error is not a reason to reinstall the browser or to run a registry cleaner. If other sites load, you are not disconnected, and the problem belongs to a different code.