Whitelisted IP in India, after 48 hours site still not reachable & 512 error for user

How can I set up for this user to access my website:
See my work here, does this look correct:

Edit Firewall Rule
Rule name
Give your rule a descriptive name
allow
When incoming requests match…
Field
IP Source Address
Operator
equals
Value
103.41.25.244
Expression Preview
Edit expression
(ip.src eq 103.41.25.244)
Then…
Choose an action
Allow

A 512 error doesn’t sound like it comes from Cloudflare. Can you post a screenshot of it?

Oh…that’s a 521, not a 512. It’s quite possible the server is blocking Cloudflare’s local POP. Make sure the host ALLOWS everything from IP Ranges | Cloudflare

Thank you and sorry for my error in the number 521!
Best
Ken

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