When attempting to browse a domain using File Manager, Nginx shows the following error:
502 bad gateway
The following error appears in
[error] 22141#0: *5765 upstream sent too big header while reading response header from upstream, client: 10.30.87.27, server: , request: "GET /smb/file-manager/list?currentDir=/%2Fhttpdocs HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "example.com:8443", referrer: "https://example.com:8443/smb/web/view"
The issue is triggered by the existence of a large number of files in the directory that you tried to open.
For earlier releases of Parallels Plesk 11.5, the following workaround can be applied:
Back up the original configuration file:
# cp -p /etc/sw-cp-server/config /etc/sw-cp-server/config.backup.`date +%F`
Increase the FastCGI buffer size to resolve the issue as below:
# cat /etc/sw-cp-server/config|grep 'fastcgi_buffer' fastcgi_buffers 128 2048k; fastcgi_buffer_size 2048k;