521 error, despite the server is on

Hello everyone, please do not close the topic. The website is down, despite the server is on and i connect to the root and FTP also to webmin. I checked the server it is really on, i do not use a firewall. The provider says everything is on and i should check the Cloudflare https://tvoti.com/
Please it is a fatal error for me, the website is since 3 hours down

A post was merged into an existing topic: After rebooting the vps cloudflare is unable to connect website