I had the same problem:
Nginx cut off some responses from the FastCGI backend. For example, I couldn’t generate a proper SQL backup from PhpMyAdmin. I checked the logs and found this:
2012/10/15 02:28:14 [crit] 16443#0: *14534527 open()
“/usr/local/nginx/fastcgi_temp/4/81/0000004814” failed (13: Permission
denied) while reading upstream, client: *, server: , request:
“POST / HTTP/1.1″, upstream: “fastcgi://127.0.0.1:9000”, host:
““, referrer: “http://*/server_export.php?token=**“
All I had to do to fix it was to give proper permissions to the /usr/local/nginx/fastcgi_temp folder, as well as client_body_temp.
Fixed!
Thanks a lot samvermette, your Question & Answer put me on the right track.