503 returning FetchError c http first read error: -1 0

[Poul-Henning Kamp]

In message <AANLkTimCTvOHodzWuz8YYn0mkqFUztJ+T=C2qiu7Kd+i at mail.gmail.com>, Adam
 McManus writes:

>   27 VCL_call     c pass pass
>   27 Backend      c 29 rr_director server9
>   27 FetchError   c http first read error: -1 0 (Success)
>   27 VCL_call     c error deliver

To me this looks like your backend does not answer inside the
"first_byte" timeout.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.