Here we go. I found the websites are not available at noon. I checked the server status. All good. But the websites return a 404 error.
OK, I just restarted the PHP-FPM service. Because the static page is OK. So the Nginx web server is OK.
I restarted the PHP-FPM service multiple times. The server is not working after a few minutes. So I guess it is the DoS attacking.
I check the Cloudflare dashboard.
One of my websites has tons of requests in a very short time period.
The blue line jumped at 9:00 AM. I just noticed it at noon. So I changed the security setting.
The blue line dropped as per my expectation.
Look at the yellow/orange line. It represented the requests blocked or challenged by Cloudflare.
It is the security information on the Cloudflare dashboard.
