Host not getting resolved when IP is proxied

NAS is with public IP. Not firewalled. If the IP in the A record is proxied, the host is not resolving. Blue screen appears without error, no login page of NAS is loaded.
However, if the IP is not proxied, all is well, login page of NAS opens nicely.
Kindly help if anybody have any idea on it.
Thank you!

This means the hostname is resolving. It’s some other problem.

What’s the URL?

docs.saarc-sec.org

It’s returning a 521 for me. A 521 error happens when Cloudflare is unable to make a TCP connection to your origin server. Review the suggestions in this Community Tip for Quick Fix Ideas.

can you kindly verify it for me once again, if it is working for you now
Thx

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