502 BAD Gateway with my Dedicated Server

Hi Cloudflare
502 BAD Gateway error with my dedicated server.
I am using a dedicated server. But when I add an account into Cloudflare then website goes an error 502 BAD Gateway. How can I solve it?

Installed NGINX into my server.

check your nginx error log. This is usually when NGINX can’t connect to your application backend (php/go/etc). Also -> Community Tip - Fixing Error 502 / 504: Bad Gateway

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