thanks Max. I will check and update you.

George

On Tue, Jan 3, 2012 at 7:54 AM, Maxim Dounin <mdounin@mdounin.ru> wrote:

> Hello!
>
> On Mon, Jan 02, 2012 at 12:37:36PM +0800, Geoge.Q 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;
> > 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"
> > -------------------------------------------------
>
> The "upstream" and "server" seems to be the same, so it looks
> like you've created an infinite proxy loop.
>
> Maxim Dounin
>
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