Error 522 connection timeout(host error)

My site server works fine, but I get the Error 522 Connection timeout.
How can I fix this issue?
this backend is developed by php symfony and Next.js in frontend.

Please help me
thank you

As search for #CommunityTip 522, asmentioned in the text area, would have revealed the following: :wink:

It’s most likely a host error or misconfiguration.

Thanks Mark, But my server works correctly and server is fine. and the site sometimes run but after a few hours and a few days, it had issues.
Also, where can I see the “ERR_CONNECTION_TIMED_OUT”?

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