upstream sent invalid status "" while reading response header from upstream
September 29, 2014 05:00PM
Just started getting 502 Bad Gateway and in the nginx error log I see:

upstream sent invalid status "" while reading response header from upstream

When I restarted php-fpm, everything went back to normal and working. Did something with php-fpm just go wrong? I don't see anything in the php-fpm error logs. What typically causes this, and what are some fixes to prevent it from happening again.
Re: upstream sent invalid status "" while reading response header from upstream
November 06, 2014 04:56PM
I'm having the same problem. You are lucky because even though I restarted php-fpm, it didn't go back to normal...
Re: upstream sent invalid status "" while reading response header from upstream
August 06, 2018 08:10AM
I faced the same problem too, and restarted php-fpm and things went back fine.
I don't know the cause, but seems it's related to nginx
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