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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