Nginx upstream servers status

[Sandeep L]

While looking at logs following message appeared:
[error] 16488#0: *80 upstream timed out (110: Connection timed out) while connecting to upstream, client: IP, server: , request: "GET /assets/images/transparent.png HTTP/1.1", upstream: "http://host2.example.com:8080/assets/images/transparent.png", host: "hostname", referrer: "http://hostname"
Thanks,Sandeep.

> To: nginx at nginx.org
> Subject: Re: RE: Nginx upstream servers status
> From: nginx-forum at nginx.us
> Date: Wed, 3 Jul 2013 02:39:33 -0400
> 
> i'd suggest you'll start with low-level-debugging:
> - goto host1 and make a tcpdump port 8080 / tail -f against access-logs
> of that server; 
> - make a request
> - check., what happens to that request, e.g. where it "hangs"
> 
> you could also, just in case, make a "tcpdump port 808 and host host2" onm
> your nginx, just to make sure that nginx is sending the requests to the
> right server
> 
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,240513,240523#msg-240523
> 
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