Question:502 Bad Gateway error is shown after login to Plesk or performing any actions: Connection reset by peer
Symptoms
- While accessing Plesk or performing any actions the following error is shown:
502 Bad Gateway- The following error message appears in /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>
OR
[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/"
Cause
Low FastCGI buffer limits.
Resolution
1.Connect to the server via SSH.
2.Open /etc/sw-cp-server/config with a text editor:
#vi /etc/sw-cp-server/config
3.Increase FastCGI buffer limits using the editor:
#fastcgi_buffers 32 32k;
fastcgi_buffer_size 64k;4.Restart sw-cp-server and sw-engine services:
#service sw-cp-server restart && service sw-engine restart