12 FetchError c http first read error: -1 0 (No error recorded)
Jean,
Got into same situation myself and replying mostly for documentation
purposes,
since your original post was quite some time ago.
Found that Apache was closing keep-alive connection improperly in some cases
(at least this is how I understand keep-alive).
Varnish sent request during keep-alive session,
Apache closed connection in return.
Apache configuration "KeepAlive Off" solved it for me.
For complete details I posted my findings here:
https://www.varnish-cache.org/forum/topic/1468
Ragnar
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