Error 522 Issue Server response too long / not response

Hello ,

I am running test server , from my home with static IP address,
the problem is when try to full Full (Encrypts end-to-end, using a self signed certificate on the server )
Option got 522 error , tried with another Domain , Deploy Certificates
Also using Ubuntu latest and tried with off firewall still not working ,
I have found some Issue that , some ip from Cloudflare not pinging ,
Also talk to my ISP they confirmed about no Blockages Situation ,
Please anyone have suggestion how to get ride from it ??

Example URL : https://robengg.com/

Regards
ROB

Have you already tried following the articles from below?:

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