Help on "AH01067: Failed to read FastCGI header" error

[roath]

Hello, I would like some assistance or guidance concerning the error explained below. Since last thursday my server is experiencing an specific error for a few ours (1h-2h) a day, usually at the same time period each day   21:00 GMT thru 0:00 GMT. Below, the error message (just two lines extracted from file error.log - apache server for linux - from the hundreds of similar lines):

[Tue Sep 03 21:17:20.820208 2019] [proxy_fcgi:error] [pid XXX:tid XXXXX] [client <ip>:<port>] AH01067: Failed to read FastCGI header, referer: https://peps.com.br/curso-inicio/ [Tue Sep 03 21:17:20.842911 2019] [proxy_fcgi:error] [pid XXX:tid XXXXX] (104)Connection reset by peer: [client <ip>:<port>] AH01075: Error dispatching request to : , referer: https://peps.com.br/curso-inicio/

-- During this period, my site is so slow it doesn't work (503 error sometimes or just not load). -- Diagnostics: 1) the load_average of the server goes from 0.9-1.0 to 25-30...  explosive load in a short time. 2) From Google Analytics, only 10 simultaneous users on the site. The daily average of simultaneous users is around 8. 3) The processess that are consuming the resources are "php-fpm"... several of them! I've read that this kind of error are memory related or from buggy PHP code. Yesterday I've managed to "stop" the error (after 20 minutes) removing temporarily the "plugins" folder from the site - the same as desactivating all plugins at once - then enabling one by one (but I couldn't find which one was buggy as the error didn't occur again). Do you experience this kind of error or someone of the community relates to this error? Please I would like some guidance in order to stop this from happening. Thank you very much. Best regards, Rodrigo

[Anshuman Sahu]

Hi the reason is load on server or a php error in code . to check php error in code please share your server php error log . you can upload it somewhere online and share its link here . Second is to find the plugin which is putting too much load on server .  install this plugin "query monitor"
refer this tip to know which plugin is actually putting load on your server : https://kinsta.com/blog/query-monitor/  

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