Maxim Dounin Wrote:
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> There is proxy_read_timeout (http://nginx.org/r/proxy_read_timeout)
> which as well applies to WebSocket connections. You have to bump
> it if your backend do not send anything for a long time.
> Alternatively, you may configure your backend to send websocket
> ping frames periodically to reset the timeout (and check if the
> connection is still alive).

Thanks, raising the timeout resolved the problem.