How to trace if the request fails before get to varnish or at varnish?

[Paul A. Procacci]

How would you debug it without using varnish?  The method of debugging
doens't change.

- tcpdump
- is the firewall max'd ?
- resources on the machine
- max fd's per process, etc., etc.

~Paul

On Fri, Jul 20, 2012 at 08:56:18AM -0700, Abraham Cruz Sustaita wrote:
>    I have two varnish servers. If the request to the backend fails,
>    varnish throws an error page, but the problem is that now Varnish is
>    radomly failing. The connection expires and I see the error (at
>    firefox) "The server is taking too much time to respond". Is there any
>    way I can debug if the problem is with varnish or before?  I have one
>    switch, one firewall and one load balancer before varnish

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