Webserver error if proxy is used

What is the name of the domain?

poscoipc.com

What is the error number?

404 and 403

What is the error message?

403 You don’t have permission to access this resource or page not found or 404 The requested URL was not found on this server.

What is the issue you’re encountering

getting above error when cloudflare proxy is enabled.

What steps have you taken to resolve the issue?

have tried to make several difference configuration settings in cloudflare.
above website is in aws linux.

What are the steps to reproduce the issue?

go to website with cloudflare proxy disabled and it works. enable the proxy and it will not work.
if i use only domain name in browser then error is
You don’t have permission to access this resource. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
if use domainname/ExactPageName then i get a 404 error ie The requested URL was not found on this server.
i have a feeling that cloudflare proxy is passing on the ip address instead of the domain name to my aws server which would give such and error

thanks
rajesh

Screenshot of the error

From the sahred screenshot, the 403 error is coming from the origin server/host.

However, recently I tried to access your Website and was presented with the Cloudflare’s Default Webpage for 1020/1005 error due to your Security Settings:

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