# Nginx upstream prematurely closed connection **URL:** \ **Category:** NGINX\ **Created:** [March 29, 2012, 5:52pm UTC](https://www.ruby-forum.com/t/nginx-upstream-prematurely-closed-connection/218370 "2012-03-29T17:52:12Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [March 29, 2012, 5:52pm UTC](https://www.ruby-forum.com/t/nginx-upstream-prematurely-closed-connection/218370/1 "2012-03-29T17:52:12Z")
Hello, I’m using nginx as a reverse proxy to handle static files with apache to handle dynamic file .php I’m receiving too many errors ( Bad Gateway 502 ) when i’m using vBulletin , joomla , wordpress in PHP Post or curl() inside php. I reviewed log i noticed this error is frequently appears: “upstream prematurely closed connection while reading response header from upstream” Nginx version: nginx/1.0.11Apache/2.2.22PHP 5.2.17 Thanks ---
**Author:** ![Ramy\_Allam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/58956e/32.png) [@Ramy\_Allam](https://www.ruby-forum.com/u/Ramy_Allam)\ **Post date:** [March 30, 2012, 2:02pm UTC](https://www.ruby-forum.com/t/nginx-upstream-prematurely-closed-connection/218370/2 "2012-03-30T14:02:11Z")
Hello! On Thu, Mar 29, 2012 at 03:51:31PM +0000, Ramy Allam wrote: > Hello, > I’m using nginx as a reverse proxy to handle static files with apache to handle > dynamic file .php > I’m receiving too many errors ( Bad Gateway 502 ) when i’m using vBulletin , > joomla , wordpress in PHP Post or curl() inside php. > I reviewed log i noticed this error is frequently appears: > “upstream prematurely closed connection while reading response header from > upstream” > Nginx version: nginx/1.0.11Apache/2.2.22PHP 5.2.17 > Thanks Such messages usually appear due to upstream server crash and/or process termination due to some limits (memory, cpu, execution time…). Try looking into apache logs and/or system logs to see what happens. Maxim D. ---
**Author:** ![Ramy\_Allam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/58956e/32.png) [@Ramy\_Allam](https://www.ruby-forum.com/u/Ramy_Allam)\ **Post date:** [April 9, 2012, 3:35pm UTC](https://www.ruby-forum.com/t/nginx-upstream-prematurely-closed-connection/218370/3 "2012-04-09T15:35:39Z")
This is also proxy log, not the static content request log. You should be sure you have enough resources in your backend server, like memory, connection… 2012/4/9 Tariq wali [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![Ramy\_Allam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/58956e/32.png) [@Ramy\_Allam](https://www.ruby-forum.com/u/Ramy_Allam)\ **Post date:** [April 9, 2012, 1:42pm UTC](https://www.ruby-forum.com/t/nginx-upstream-prematurely-closed-connection/218370/4 "2012-04-09T13:42:41Z")
Maxim, I see the same error on few of our lamp servers and nginx serving static content . I have looked for clues in apache error logs and syslog messages but can’t establish a connection … 2012/03/21 00:00:01 [error] 569#0: \*10867863 upstream prematurely closed connection while reading response header from upstream, client: 121.243.22.130, server: \_, request: “GET / HTTP/1.1”, upstream: “[http://127.0.0.1:8080/](http://127.0.0.1:8080/)”, host: “[servername.net](http://servername.net)” 2012/03/22 00:00:01 [error] 568#0: \*10869967 upstream prematurely closed connection while reading response header from upstream, client: 121.243.22.130, server: \_, request: “GET / HTTP/1.1”, upstream: “[http://127.0.0.1:8080/](http://127.0.0.1:8080/)”, host: “[servername.net](http://servername.net)” 2012/03/23 00:00:01 [error] 569#0: \*10872221 upstream prematurely closed connection while reading response header from upstream, client: 121.243.22.130, server: \_, request: “GET / HTTP/1.1”, upstream: “[http://127.0.0.1:8080/](http://127.0.0.1:8080/)”, host: “[servername.net](http://servername.net)” I would appreciate a direction I can take this issue in …’ T