502 & 504 error, again

Server NGINX
1

I know it should be a well-known issue.
I searched and try to find out what on earth it is, but I failed.

Step:

  1. nginx works as reverse proxy and the version is V1.0.5,
    OS: Debian 5.0.3, Kernel Version 2.6.32

  2. Enabled http 1.1, 504 error is popup in client;
    the error log indicates:

2011/12/30 09:40:06 [error] 11013#0: *1 upstream timed out (110:
Connection
timed out) while reading response header from upstream, client:
10.208.127.142, server: 1.1.1.1, request: “POST
/QueryStatManage/StatStudentAction.aspx HTTP/1.1”, upstream: "
http://1.1.1.1:80/QueryStatManage/StatStudentAction.aspx", host:
“1.1.1.1”,
referrer: “http://1.1.1.1/QueryStatManage/StatStudentAction.aspx”

  1. increase the vaule

    proxy_read_timeout 600s
    proxy_send_timeout 600s

    this time, it is poped up 502, the error logs indicates

2011/12/30 09:53:54 [error] 11173#0: *1 upstream prematurely closed
connection while reading response header from upstream, client:
10.208.127.142, server: 1.1.1.1, request: “POST
/QueryStatManage/StatStudentAction.aspx HTTP/1.1”, upstream: "
http://1.1.1.1:80/QueryStatManage/StatStudentAction.aspx", host:
“1.1.1.1”,
referrer: “http://1.1.1.1/QueryStatManage/StatStudentAction.aspx”

  1. Someone told me that there is a kernel bug in linux, I am not sure,
    can
    someone see the same issue ?

thanks
George

2

Hello!

On Mon, Jan 02, 2012 at 12:37:36PM +0800, Geoge.Q wrote:

2011/12/30 09:40:06 [error] 11013#0: *1 upstream timed out (110: Connection
timed out) while reading response header from upstream, client:
10.208.127.142, server: 1.1.1.1, request: “POST
/QueryStatManage/StatStudentAction.aspx HTTP/1.1”, upstream: "
http://1.1.1.1:80/QueryStatManage/StatStudentAction.aspx", host: “1.1.1.1”,
referrer: “http://1.1.1.1/QueryStatManage/StatStudentAction.aspx”

The “upstream” and “server” seems to be the same, so it looks
like you’ve created an infinite proxy loop.

Maxim D.

3

thanks Max. I will check and update you.

George

4

On Sun, Jan 1, 2012 at 11:37 PM, Geoge.Q [email protected] wrote:

I know it should be a well-known issue.
I searched and try to find out what on earth it is, but I failed.

Step:

  1. nginx works as reverse proxy and the version is V1.0.5,
    OS: Debian 5.0.3, Kernel Version 2.6.32

  2. Enabled http 1.1, 504 error is popup in client;

You enabled the HTTP/1.1 protocol? Where? What were you doing before?

the error log indicates:

2011/12/30 09:40:06 [error] 11013#0: *1 upstream timed out (110: Connection
timed out) while reading response header from upstream, client:
10.208.127.142, server: 1.1.1.1, request: “POST
/QueryStatManage/StatStudentAction.aspx HTTP/1.1”, upstream:
“http://1.1.1.1:80/QueryStatManage/StatStudentAction.aspx”, host: “1.1.1.1”,
referrer: “http://1.1.1.1/QueryStatManage/StatStudentAction.aspx”

How large is the POST?

/QueryStatManage/StatStudentAction.aspx HTTP/1.1", upstream:
“http://1.1.1.1:80/QueryStatManage/StatStudentAction.aspx”, host: “1.1.1.1”,
referrer: “http://1.1.1.1/QueryStatManage/StatStudentAction.aspx”

Does the back end application work without nginx as proxy? What is the
nginx configuration? We need details to help you.

  1. Someone told me that there is a kernel bug in linux, I am not sure, can
    someone see the same issue ?

Irrelevant. These are HTTP errors, with HTTP logging. If you have
kernel errors, send your logs to the appropriate maintainers :slight_smile:

You are running an ASP.NET application. You have to correctly set
proxy timeouts and buffer sizes to proxy to ASP applications, assuming
the application works.

Stefan C.
http://scaleengine.com/contact