varnish 4 503 issue

[Marcello Lorenzi]

Hi All,
we installed a varnish 4.1.0 instance on our stage environment and we
configured the cache to probe 2 backends on different servers.

we noticed that in same cases the cache reports 503 error and into the
varnishlog entries we found the Backend fetch failed error, but if we
verify the backend status on varnishadm the backend are healthy.

Could you help us to check this issue?

Thanks,
Marcello
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