recv() failed (104: Connection reset by peer) while reading response header from upstream
In most cases, this error is related to Nginx configuration.
Just Google it, there's a lot of answers on this.
Thank you @nikolai ! This is a very helpful hint. I will investigate and let you know what comes out of it.
I have tested the solution proposed by this source, which addresses this specific nginx server error: https://www.digitalreborn.com/fix-nginx-connection-reset-by-peer-upstream/
but the "Bad gateway - 502" error is still there. :-(
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