502 errors and request_time (no replies)

Hi:

I've found 2 kinds of 502 errors in my server:

connection reset by peer, it happens as request_time reach to 10s.

connection timeout, it happens as request_time reach to 3s.

Server is:

centos , kernel(2.6.32)

php5.2 php-fpm

nginx 1.6.3.

access logs outputs:
[28/Nov/2015:14:41:08 +0800] "GET /ben2.php HTTP/1.1" 502 172 "-" "Apache-HttpClient/4.2.6 (java 1.5)" "-" 3.000

[28/Nov/2015:14:41:11 +0800] "GET /ben2.php HTTP/1.1" 502 172 "-" "Apache-HttpClient/4.2.6 (java 1.5)" "-" 10.000
error logs:
2015/11/28 14:41:11 [error] 12981#0: *798323 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: xx.xx.xx.xx, server: xx.xx.xx, request: "GET /ben2.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "xx.xx.xx"

2015/11/28 14:41:08 [error] 12981#0: *798215 connect() failed (110: Connection timed out) while connecting to upstream, client: xx.xx.xx.xx, server: xx.xx.xx, request: "GET /ben2.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "xx.xx.xx"



I've tried "request_terminate_timeout, fastcgi_connect_timeout, fastcgi_read/write_timeout", but no help.

What can I do next step ?_______________________________________________
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