There is a great possibility that the reason for ERR_CONNECTION_TIMED_OUT error message is the great amount of cookies and cache files accumulated in your device. In order to fix this error code and regain internet access, you need to clear the cache files, the cookies and unnecessary data.
If you want to learn how to clear the browser's cache (and cookies), check the don't know how to clear the cache solutions and don't know how to delete browser cookies guide.
Maybe a temporary issue with the router and/or modem is the reason for the "This site can't be reached ERR_CONNECTION_TIMED_OUT" error message. In this case, try restarting the router (and the modem, if you use one), by unplugging them from power for a couple of minutes and then plugging them back in.
Maybe the reason for this issue is the ISP or the operator itself. There are cases when people can't access websites just because those websites are blocked by the ISP or the operator itself, for various reasons. Maybe there is a malfunction in the network of the provider. To be 100% sure, contact the support team, tell them the URL of the website you can't visit and they will instruct you on what to do next.
A quick way to fix the possible reasons for this issue is to enable and disable the airplane mode. Enabling and disabling the Airplane mode is like a soft restart of the device's components, some of which are the Wi-Fi and mobile data.
If you are not sure how to enable and disable it, read the instructions in the don't know how to enable/disable the Airplane mode guide.
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