# Upstream Prematurely Closed Connection **URL:** \ **Category:** NGINX\ **Created:** [April 15, 2010, 12:51am UTC](https://www.ruby-forum.com/t/upstream-prematurely-closed-connection/186964 "2010-04-15T00:51:54Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![APseudoUtopia](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/d26b3c/32.png) [@APseudoUtopia](https://www.ruby-forum.com/u/APseudoUtopia)\ **Post date:** [April 15, 2010, 12:51am UTC](https://www.ruby-forum.com/t/upstream-prematurely-closed-connection/186964/1 "2010-04-15T00:51:54Z")
I recently upgraded PHP from 5.2.9 to 5.3.2. Ever since then, nginx hasn’t been working properly. BUT, I can tell that it is not php’s fault because another domain is working perfectly (using the same nginx instance). nginx version: nginx/0.7.65 [admin.mysite.com](http://admin.mysite.com) works perfectly. I have some PHP scripts on that subdomain, and they work perfectly. However, [mysite.com](http://mysite.com) gives a 502 HTTP error. The error logs in nginx give: 2010/04/14 21:57:54 [error] 93347#0: \*35 upstream prematurely closed connection while reading response header from upstream, client: 96.x.x.x, server: [mysite.com](http://mysite.com), request: “GET / HTTP/1.1”, upstream: “fastcgi://127.0.0.1:9000”, host: “[mysite.com](http://mysite.com)” nginx is serving other non-php files perfectly fine (for example, images and javascript). But all php files give the 502 error. The php-cgi processes are started using spawn-fcgi. I have 20 child processes set to run. I have monitored them throughout many requests and none of them seem to be dying - they all exist after the 502 errors. Here’s my entire nginx.conf. There are a couple servers: the admin site, a couple ssl/www redirects, then the main site. PHP on the admin site works fine, but PHP on the main site does not work as mentioned above. [http://pastie.org/private/hwi3niwgyynmcpvlgkuuxg](http://pastie.org/private/hwi3niwgyynmcpvlgkuuxg) Here’s the fastcgi\_params include: [http://pastie.org/private/edbmxdtqkazapisegq6ua](http://pastie.org/private/edbmxdtqkazapisegq6ua) Does anyone know why this is happening? Thank you.