recv() failed (104: Connection reset by peer) while reading response header from upstream

Hello,

Me and my business partner experiencing the same issue at around the same time.

We run large PHP crawl scripts that sometimes takes an hour of 3. We have never experienced issues with this as we used all the correct time out en buffer settings (nginx and php). If we run our scripts it randomly 502's with the following log entry:
4214#0: *17080 recv() failed (104: Connection reset by peer) while reading response header from upstream

I have Google myself tired and have tried every...

recv() failed (104: Connection reset by peer) while reading response header from upstream