Direct access to server is ok. proxied domains are offline.. why?

Suddenly all the sites went down & started showing 522 errors. i tried accessing my server directly with ip & that was working 100% ok. why cloudflare proxied domains got this issue.

You’ll have to provide more information if you want anyone to be able to help you.

What is your domain? Can you pause Cloudflare to allow further testing?

now it started working again. around after 4 to 5 minutes.

but when this problem occurred i tried accessing my server with direct ip / non proxied domain. & it was working fine. it means server was responding. i checked server resources & they were 80% free.

domains include:

but now they’re all fine & started working.

question is why this problem occurred. when i was not using cloudflare i never faced this kind of issue.