I’ve been using cloudflare for a long time, but recently I started getting the 521 error.
https://www.cloudflare.com/ips/ We have whitelisted the ip addresses written here by hosting.
When cloudflare is turned off, the problem is fixed. When cloudflare is turned on, the problem persists.
my hosting ip address: 126.96.36.199
my domain name is hasaneryilmaz.net