Sintomas

• Ao acessar o Plesk ou realizar qualquer ação o seguinte erro é mostrado:

  502 Bad Gateway

• A seguinte mensagem de erro aparece em /var/log/sw-cp-server/error_log:

  recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 203.0.113.2, server: , request: "POST <some url>

  OU

  [error] 17434#0: *4954 upstream sent too big header while reading response header from upstream, client: 203.0.113.2, server: , request: "GET /modules/xovi/index.php/log-analyzer/index/id/2 HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "example.com:8443", referrer: "https://example.com:8443/"

Causa

Limites baixos de buffer FastCGI.

Resolução

1. Conecte-se ao servidor via SSH .

2. Abra /etc/sw-cp-server/config com um editor de texto :

   # vi /etc/sw-cp-server/config

3. Aumente os limites do buffer FastCGI usando o editor:

   fastcgi_buffers 32 32k; fastcgi_buffer_size 64k;

4. Reinicie os serviços sw-cp-server e sw-engine:

   # service sw-cp-server restart && service sw-engine restart