Client browser is not receiving response from server and remains waiting for it

Server NGINX
1

Hello, I’m having weird a problem with nginx.

Sometimes, when I try to access the pages of my dedicated server from my
browser, I receive no response. My browser remains waiting with no stop
(there is no timeout).

I have a dedicated server, with 2 virtual machines. One of them, acts as
a
reverse proxy (with nginx), and the other one, acts as a webserver
(nginx
too).
I’m tailing the logs. When It happens, logs looks like this:
201.235.64.64 - icarabantes [27/Jul/2012:04:01:16 +0400] “GET
/admin/notification HTTP/1.1” 200 2287 “http://matweb.com/admin/”
“Mozilla/5.0
(X11; Linux i686; rv:12.0) Gecko/20100101 Firefox/12.0”
It throws a 200 response, but my browser has never received it.

The most annoying thing it’s that it happens eventually, and then after
many retrials it comes back…
Any ideas???

2

Hello!

On Fri, Jul 27, 2012 at 06:35:00PM -0300, Matias Montenegro wrote:

201.235.64.64 - icarabantes [27/Jul/2012:04:01:16 +0400] “GET
/admin/notification HTTP/1.1” 200 2287 “http://matweb.com/admin/”
“Mozilla/5.0
(X11; Linux i686; rv:12.0) Gecko/20100101 Firefox/12.0”
It throws a 200 response, but my browser has never received it.

The most annoying thing it’s that it happens eventually, and then after
many retrials it comes back…
Any ideas???

I would try to tcpdump what happens on the wire, preferably on
both ends (i.e. nginx and a client). From the description above
it looks like some wierd network problems, probably caused by some
misbehaving firewall.

Maxim D.

3

Hi Matias,

This sounds to me very similar to a problem I have been having recently
with the latest version of Chrome under Windows 7 64 bit.

For me it was an XMLHTTPRequest would be sent, logged at the server as
completed, but no reply received.

I an sure it is an intermittent bug in Chrome, but I have been unable to
reliably reproduce it.

Ian