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Varnish Error 503 Backend fetch failed

Varnish Error 503 Backend fetch failed

Hi,

 

I install magento 2.1.0 with varnish and nginx.

 

All works fine until I active full page cache.

 

When i enable it, all work fine except some category

 

Top category did'nt work and return :

Error 503 Backend fetch failed

 

All other pages work fine. So I suppose this is my issue :

 

http://devdocs.magento.com/guides/v2.0/config-guide/varnish/tshoot-varnish-503.html

 

I put a huge value on http_resp_hdr_len and restart my varnish but nothing change i always got this issue.

 

I varnish log i can read :

 

-   FetchError     http read error: overflow

Did someone got a solution ?

 

I'm on varnish 4.0.2

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