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Answering Own question:

A: Nginx and Apache time outs should be greater than 600 sec

B: If your HTTP google cloud load balancer has multiple ports in the backend service like 80,443 . It causes this bug.

HTTP(S) load balancers proxy the connection to 80 so you dont need ,443 in the backend.

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Answer in description for "Slow performance or 502s "failed_to_connect_to_backend"

A: Nginx and Apache time outs should be greater than 600 sec

B: If your HTTP google cloud load balancer has multiple ports in the backend service like 80,443 . It causes this bug.

HTTP(S) load balancers proxy the connection to 80 so you dont need ,443 in the backend.

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