Add domain name to VPS Server

i bought a domain name and a vps server hosted on ubuntu 22.04. But there's a problem when I try to point the domain name to the vps server, it displays an error 521. Namely, my server has no firewall activated and no ip blocked. It authorizes connections on port 80. I don't understand where this error could be coming from, knowing that I've correctly pointed the domain name to the server... I have an A record with name "@" pointed to the IP Adress of the VPS Server, and a CNAME record with name "www" pointed to my domain name.
2 Replies
Cyb3r-Jak3
Cyb3r-Jak35mo ago
You should setup SSL on the server. If you are making a HTTPS request then Cloudflare will attempt 443.
Cyb3r-Jak3
Cyb3r-Jak35mo ago
Cloudflare Docs
Troubleshooting Cloudflare 5XX errors · Cloudflare Support docs
When troubleshooting most 5XX errors, the correct course of action is to first contact your hosting provider or site administrator to troubleshoot and …
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