Error 520 Web server is returning an unknown error

Hi Experts, I have facing an issue on DOMAIN,
Error:
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Error 520 Web,  server is returning an unknown error
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Few Days back when cloud-flare has issue over the world 31-August-2020, right after i am facing this error in some domains on some countries, i have 10+ domains on CWP and 6 of them are not accessible in some countries and 4 are working fine.

Please suggest a solution what to do with it??? Cloudflare departments says their Routers and DC are operational worldwide on 1-sep-2020 but my domains are still not working on some countries. any solution for it..?

Check logs in /usr/local/apache/domlogs/

Happened to me too. I've opened a thread here but eventually found the fix by myself. Maybe it's the same with your.
http://forum.centos-webpanel.com/index.php?topic=9527.0

Happened to me too. I've opened a thread here but eventually found the fix by myself. Maybe it's the same with your.
http://forum.centos-webpanel.com/index.php?topic=9527.0

can you tell me the http2 file path which you have mention in this topic...

Check logs in /usr/local/apache/domlogs/

nothing found in this, please tell me a good solution with good guide.

Everything you can find placed in /usr/local/apache/domlogs/
Try to ask a sysadmin to check your server and website or use paid CWP support service.