One of my DO servers that we are using as a test environment works well most of the time, but at seemingly random times, the server responds with a “502 Bad Gateway” error.

In the nginx logs, I can see the following error message:
2019/06/27 13:46:15 [error] 1013#1013: *19539 connect() to unix:/var/run/php/php7.3-fpm.sock failed (111: Connection refused) while connecting to upstream, client:, server:, request: “POST /client/communicationNotifyAlerts HTTP/2.0”, upstream: “fastcgi://unix:/var/run/php/php7.3-fpm.sock:”, host: “”, referrer: “

I’m guessing this could be happening after updating our php code but not performing a restart? Could this be caused by something else.

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1 answer


It looks like that your PHP FPM service is crashing. If you see that 502 error just try starting PHP FPM and it should start working as normal.

I would recommend checking your syslogs to further investigate the problem, maybe your server is out of RAM and that’s why PHP FPM gets killed.

Hope that this helps!

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