How to investigate 522 error - any tools?

I’ve got 522 error
I’ve read about this :
https://support.cloudflare.com/hc/en-us/articles/115003011431#522error
and this

Is it possible to use special diagnostics tools to identify problem clear?

Question 2:
If I have Plesk firewall rules - do you have step by step Manual how to add Cloudflare IPs to allow access to the server?

No , That is Still not created , But that can be created in the FUTURE

Could you explain about Rules for firewall?
What IP should I add to allowed list for my server?

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