Hello WordOps's Experts
I am using WP with Elementor plugin on my website, is hosting at Vultr
When I edit a page using Elementor I will get error 520. The error log of the site is:
2020/08/04 15:43:50 [error] 20570#20570: *34916 no live upstreams while connecting to upstream, client: 2402:800:63b5:8946:50a3:a42d:e65b:9675, server: webservices.market, request: "POST /wp-admin/admin-ajax.php HTTP/1.1", upstream: "fastcgi://php74", host: "webservices.market", referrer: "https://webservices.market/"
2020/08/04 15:45:05 [error] 20570#20570: *35018 upstream sent too big header while reading response header from upstream, client: 2402:800:63b5:8946:50a3:a42d:e65b:9675, server: webservices.market, request: "POST /wp-admin/admin-ajax.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php74-two-fpm.sock:", host: "webservices.market", referrer: "https://webservices.market/"
2020/08/04 15:45:10 [error] 20570#20570: *35043 upstream sent too big header while reading response header from upstream, client: 2402:800:63b5:8946:50a3:a42d:e65b:9675, server: webservices.market, request: "POST /wp-admin/admin-ajax.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php74-fpm.sock:", host: "webservices.market", referrer: "https://webservices.market/wp-admin/post.php?post=18&action=edit"
2020/08/04 15:45:10 [error] 20570#20570: *35044 no live upstreams while connecting to upstream, client: 2402:800:63b5:8946:50a3:a42d:e65b:9675, server: webservices.market, request: "POST /wp-admin/admin-ajax.php HTTP/1.1", upstream: "fastcgi://php74", host: "webservices.market", referrer: "https://webservices.market/"
Then with idea and support from @tyrro , I edit the fastcgi.conf file and change fastcgi_buffers and fastcgi_buffer_size to
fastcgi_buffers 16 256k;
fastcgi_buffer_size 512k;
But the error still happen when I try to work with Elementor, please watch the video below
Most of time the error does not happen when I work on the site but I still want to know what's the problem.
In case, if I host more sites there or have more traffic to the sites it may usually happen.
Thank you for your help!